64994473610 has 80 divisors (see below), whose sum is σ = 136263374280. Its totient is φ = 22243246080.

The previous prime is 64994473603. The next prime is 64994473637. The reversal of 64994473610 is 1637449946.

It can be written as a sum of positive squares in 4 ways, for example, as 60989735521 + 4004738089 = 246961^2 + 63283^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2475914 + ... + 2502026.

Almost surely, 2^64994473610 is an apocalyptic number.

64994473610 is an abundant number, since it is smaller than the sum of its proper divisors (71268900670).

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

64994473610 is a wasteful number, since it uses less digits than its factorization.

64994473610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26181 (or 26148 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 64994473610 in words is "sixty-four billion, nine hundred ninety-four million, four hundred seventy-three thousand, six hundred ten".