64680696976 has 135 divisors (see below), whose sum is σ = 151149178233. Its totient is φ = 26734538880.

The previous prime is 64680696959. The next prime is 64680696989. The reversal of 64680696976 is 67969608646.

The square root of 64680696976 is 254324.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 61196864400 + 3483832576 = 247380^2 + 59024^2 .

It is a super-2 number, since 2×64680696976² (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 26 ways as a sum of consecutive naturals, for example, 220753086 + ... + 220753378.

Almost surely, 2^64680696976 is an apocalyptic number.

64680696976 is the 254324-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64680696976

64680696976 is an abundant number, since it is smaller than the sum of its proper divisors (86468481257).

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

64680696976 is an equidigital number, since it uses as much as digits as its factorization.

64680696976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 141087744, while the sum is 67.

The spelling of 64680696976 in words is "sixty-four billion, six hundred eighty million, six hundred ninety-six thousand, nine hundred seventy-six".