213664025864 has 16 divisors (see below), whose sum is σ = 410391269820. Its totient is φ = 104226353920.

The previous prime is 213664025863. The next prime is 213664025891. The reversal of 213664025864 is 468520466312.

It can be written as a sum of positive squares in 2 ways, for example, as 202912409764 + 10751616100 = 450458^2 + 103690^2 .

It is not an unprimeable number, because it can be changed into a prime (213664025863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 325707029 + ... + 325707684.

Almost surely, 2^213664025864 is an apocalyptic number.

It is an amenable number.

213664025864 is a deficient number, since it is larger than the sum of its proper divisors (196727243956).

213664025864 is a wasteful number, since it uses less digits than its factorization.

213664025864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651414760 (or 651414756 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 47.

The spelling of 213664025864 in words is "two hundred thirteen billion, six hundred sixty-four million, twenty-five thousand, eight hundred sixty-four".