64961265624 has 64 divisors (see below), whose sum is σ = 164336428800. Its totient is φ = 21397014144.

The previous prime is 64961265587. The next prime is 64961265653. The reversal of 64961265624 is 42656216946.

It is a happy number.

It is a Cunningham number, because it is equal to 254875²-1.

It is a congruent number.

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, 987637 + ... + 1051355.

It is an arithmetic number, because the mean of its divisors is an integer number (2567756700).

Almost surely, 2^64961265624 is an apocalyptic number.

It is an amenable number.

64961265624 is an abundant number, since it is smaller than the sum of its proper divisors (99375163176).

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

64961265624 is a wasteful number, since it uses less digits than its factorization.

64961265624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64232 (or 64228 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 51.

The spelling of 64961265624 in words is "sixty-four billion, nine hundred sixty-one million, two hundred sixty-five thousand, six hundred twenty-four".