7256612161 has 4 divisors (see below), whose sum is σ = 7452736852. Its totient is φ = 7060487472.

The previous prime is 7256612131. The next prime is 7256612173. The reversal of 7256612161 is 1612166527.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5577251761 + 1679360400 = 74681^2 + 40980^2 .

It is a cyclic number.

It is not a de Polignac number, because 7256612161 - 2¹¹ = 7256610113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 196124653 = 7256612161 / (7 + 2 + 5 + 6 + 6 + 1 + 2 + 1 + 6 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7256612161.

It is not an unprimeable number, because it can be changed into a prime (7256612101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98062290 + ... + 98062363.

It is an arithmetic number, because the mean of its divisors is an integer number (1863184213).

Almost surely, 2^7256612161 is an apocalyptic number.

It is an amenable number.

7256612161 is a deficient number, since it is larger than the sum of its proper divisors (196124691).

7256612161 is a wasteful number, since it uses less digits than its factorization.

7256612161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196124690.

The product of its digits is 30240, while the sum is 37.

The square root of 7256612161 is about 85185.7509270183. The cubic root of 7256612161 is about 1936.0265291064.

Adding to 7256612161 its reverse (1612166527), we get a palindrome (8868778688).

The spelling of 7256612161 in words is "seven billion, two hundred fifty-six million, six hundred twelve thousand, one hundred sixty-one".