205513031634 has 16 divisors (see below), whose sum is σ = 413296927680. Its totient is φ = 68125866480.

The previous prime is 205513031621. The next prime is 205513031653. The reversal of 205513031634 is 436130315502.

It is a junction number, because it is equal to n+sod(n) for n = 205513031595 and 205513031604.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94618174 + ... + 94620345.

It is an arithmetic number, because the mean of its divisors is an integer number (25831057980).

Almost surely, 2^205513031634 is an apocalyptic number.

205513031634 is an abundant number, since it is smaller than the sum of its proper divisors (207783896046).

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

205513031634 is a wasteful number, since it uses less digits than its factorization.

205513031634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189238705.

The product of its (nonzero) digits is 32400, while the sum is 33.

The spelling of 205513031634 in words is "two hundred five billion, five hundred thirteen million, thirty-one thousand, six hundred thirty-four".