65516861556 has 96 divisors (see below), whose sum is σ = 174535495680. Its totient is φ = 21238215552.

The previous prime is 65516861521. The next prime is 65516861563.

It is a happy number.

65516861556 is a `hidden beast` number, since 6 + 5 + 5 + 1 + 6 + 86 + 1 + 556 = 666.

65516861556 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×65516861556² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 31 ways as a sum of consecutive naturals, for example, 15850066 + ... + 15854198.

It is an arithmetic number, because the mean of its divisors is an integer number (1818078080).

Almost surely, 2^65516861556 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 65516861556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87267747840).

65516861556 is an abundant number, since it is smaller than the sum of its proper divisors (109018634124).

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

65516861556 is a wasteful number, since it uses less digits than its factorization.

65516861556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8150 (or 8142 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 54.

The spelling of 65516861556 in words is "sixty-five billion, five hundred sixteen million, eight hundred sixty-one thousand, five hundred fifty-six".