65651215656 has 128 divisors (see below), whose sum is σ = 178640985600. Its totient is φ = 19985667840.

The previous prime is 65651215607. The next prime is 65651215687.

65651215656 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×65651215656² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13311511 + ... + 13316441.

It is an arithmetic number, because the mean of its divisors is an integer number (1395632700).

Almost surely, 2^65651215656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65651215656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89320492800).

65651215656 is an abundant number, since it is smaller than the sum of its proper divisors (112989769944).

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

65651215656 is a wasteful number, since it uses less digits than its factorization.

65651215656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399 (or 5395 counting only the distinct ones).

The product of its digits is 1620000, while the sum is 48.

It can be divided in two parts, 6565 and 1215656, that added together give a palindrome (1222221).

The spelling of 65651215656 in words is "sixty-five billion, six hundred fifty-one million, two hundred fifteen thousand, six hundred fifty-six".