65377616512 has 64 divisors (see below), whose sum is σ = 140330773800. Its totient is φ = 30159765504.

The previous prime is 65377616509. The next prime is 65377616543. The reversal of 65377616512 is 21561677356.

It can be written as a sum of positive squares in 4 ways, for example, as 55270129216 + 10107487296 = 235096^2 + 100536^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×65377616512² (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 7 ways as a sum of consecutive naturals, for example, 3947064 + ... + 3963592.

Almost surely, 2^65377616512 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 65377616512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70165386900).

65377616512 is an abundant number, since it is smaller than the sum of its proper divisors (74953157288).

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

65377616512 is a wasteful number, since it uses less digits than its factorization.

65377616512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18933 (or 18921 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 49.

The spelling of 65377616512 in words is "sixty-five billion, three hundred seventy-seven million, six hundred sixteen thousand, five hundred twelve".