64563571616 has 24 divisors (see below), whose sum is σ = 129263934240. Its totient is φ = 31734635968.

The previous prime is 64563571577. The next prime is 64563571649. The reversal of 64563571616 is 61617536546.

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, 17096516 + ... + 17100291.

It is an arithmetic number, because the mean of its divisors is an integer number (5385997260).

Almost surely, 2^64563571616 is an apocalyptic number.

It is an amenable number.

64563571616 is an abundant number, since it is smaller than the sum of its proper divisors (64700362624).

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

64563571616 is a wasteful number, since it uses less digits than its factorization.

64563571616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34196876 (or 34196868 counting only the distinct ones).

The product of its digits is 2721600, while the sum is 50.

The spelling of 64563571616 in words is "sixty-four billion, five hundred sixty-three million, five hundred seventy-one thousand, six hundred sixteen".