7656343121 has 4 divisors (see below), whose sum is σ = 8750106432. Its totient is φ = 6562579812.

The previous prime is 7656343117. The next prime is 7656343133. The reversal of 7656343121 is 1213436567.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1213436567 = 7 ⋅173348081.

It is a cyclic number.

It is not a de Polignac number, because 7656343121 - 2² = 7656343117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7656343111) 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, 546881645 + ... + 546881658.

It is an arithmetic number, because the mean of its divisors is an integer number (2187526608).

Almost surely, 2^7656343121 is an apocalyptic number.

It is an amenable number.

7656343121 is a deficient number, since it is larger than the sum of its proper divisors (1093763311).

7656343121 is a wasteful number, since it uses less digits than its factorization.

7656343121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093763310.

The product of its digits is 90720, while the sum is 38.

The square root of 7656343121 is about 87500.5321183820. The cubic root of 7656343121 is about 1970.9417813975.

Adding to 7656343121 its reverse (1213436567), we get a palindrome (8869779688).

The spelling of 7656343121 in words is "seven billion, six hundred fifty-six million, three hundred forty-three thousand, one hundred twenty-one".