205317996564 has 48 divisors (see below), whose sum is σ = 506139782400. Its totient is φ = 64673406336.

The previous prime is 205317996563. The next prime is 205317996607. The reversal of 205317996564 is 465699713502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205317996563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6260179 + ... + 6292890.

It is an arithmetic number, because the mean of its divisors is an integer number (10544578800).

Almost surely, 2^205317996564 is an apocalyptic number.

It is an amenable number.

205317996564 is an abundant number, since it is smaller than the sum of its proper divisors (300821785836).

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

205317996564 is a wasteful number, since it uses less digits than its factorization.

205317996564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12553152 (or 12553150 counting only the distinct ones).

The product of its (nonzero) digits is 12247200, while the sum is 57.

The spelling of 205317996564 in words is "two hundred five billion, three hundred seventeen million, nine hundred ninety-six thousand, five hundred sixty-four".