65661416656 has 60 divisors (see below), whose sum is σ = 139883956576. Its totient is φ = 29835812160.

The previous prime is 65661416629. The next prime is 65661416699.

65661416656 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×65661416656² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10348621 + ... + 10354963.

Almost surely, 2^65661416656 is an apocalyptic number.

It is an amenable number.

65661416656 is an abundant number, since it is smaller than the sum of its proper divisors (74222539920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65661416656 is a wasteful number, since it uses less digits than its factorization.

65661416656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11720 (or 11703 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 52.

The spelling of 65661416656 in words is "sixty-five billion, six hundred sixty-one million, four hundred sixteen thousand, six hundred fifty-six".