65616536064 has 160 divisors (see below), whose sum is σ = 179319951360. Its totient is φ = 21311639552.

The previous prime is 65616536057. The next prime is 65616536137. The reversal of 65616536064 is 46063561656.

It is a super-2 number, since 2×65616536064² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17251987 + ... + 17255789.

It is an arithmetic number, because the mean of its divisors is an integer number (1120749696).

Almost surely, 2^65616536064 is an apocalyptic number.

65616536064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 65616536064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89659975680).

65616536064 is an abundant number, since it is smaller than the sum of its proper divisors (113703415296).

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

65616536064 is a wasteful number, since it uses less digits than its factorization.

65616536064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4110 (or 4094 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 65616536064 in words is "sixty-five billion, six hundred sixteen million, five hundred thirty-six thousand, sixty-four".