65256661 has 4 divisors (see below), whose sum is σ = 65277472. Its totient is φ = 65235852.

The previous prime is 65256649. The next prime is 65256673. The reversal of 65256661 is 16665256.

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.

It is an interprime number because it is at equal distance from previous prime (65256649) and next prime (65256673).

It is a cyclic number.

It is not a de Polignac number, because 65256661 - 2⁵ = 65256629 is a prime.

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 65256661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65256691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4635 + ... + 12328.

It is an arithmetic number, because the mean of its divisors is an integer number (16319368).

Almost surely, 2^65256661 is an apocalyptic number.

It is an amenable number.

65256661 is a deficient number, since it is larger than the sum of its proper divisors (20811).

65256661 is a wasteful number, since it uses less digits than its factorization.

65256661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20810.

The product of its digits is 64800, while the sum is 37.

The square root of 65256661 is about 8078.1595057290. The cubic root of 65256661 is about 402.6010928768.

The spelling of 65256661 in words is "sixty-five million, two hundred fifty-six thousand, six hundred sixty-one".