213217255764 has 36 divisors (see below), whose sum is σ = 562399140576. Its totient is φ = 67982313168.

The previous prime is 213217255739. The next prime is 213217255781. The reversal of 213217255764 is 467552712312.

213217255764 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 1 + 72 + 5 + 576 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 128753554 + ... + 128755209.

Almost surely, 2^213217255764 is an apocalyptic number.

It is an amenable number.

213217255764 is an abundant number, since it is smaller than the sum of its proper divisors (349181884812).

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

213217255764 is a wasteful number, since it uses less digits than its factorization.

213217255764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257508796 (or 257508791 counting only the distinct ones).

The product of its digits is 705600, while the sum is 45.

The spelling of 213217255764 in words is "two hundred thirteen billion, two hundred seventeen million, two hundred fifty-five thousand, seven hundred sixty-four".