64911572944 has 20 divisors (see below), whose sum is σ = 132385445440. Its totient is φ = 30747587040.

The previous prime is 64911572933. The next prime is 64911572951. The reversal of 64911572944 is 44927511946.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 64911572891 and 64911572900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106762152 + ... + 106762759.

It is an arithmetic number, because the mean of its divisors is an integer number (6619272272).

Almost surely, 2^64911572944 is an apocalyptic number.

It is an amenable number.

64911572944 is an abundant number, since it is smaller than the sum of its proper divisors (67473872496).

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

64911572944 is a wasteful number, since it uses less digits than its factorization.

64911572944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213524938 (or 213524932 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The spelling of 64911572944 in words is "sixty-four billion, nine hundred eleven million, five hundred seventy-two thousand, nine hundred forty-four".