205372656091 has 16 divisors (see below), whose sum is σ = 217792447488. Its totient is φ = 193255770400.

The previous prime is 205372656053. The next prime is 205372656113. The reversal of 205372656091 is 190656273502.

It is not a de Polignac number, because 205372656091 - 2²⁹ = 204835785179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205372656191) 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, 616410 + ... + 889216.

It is an arithmetic number, because the mean of its divisors is an integer number (13612027968).

Almost surely, 2^205372656091 is an apocalyptic number.

205372656091 is a deficient number, since it is larger than the sum of its proper divisors (12419791397).

205372656091 is a wasteful number, since it uses less digits than its factorization.

205372656091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273362.

The product of its (nonzero) digits is 680400, while the sum is 46.

The spelling of 205372656091 in words is "two hundred five billion, three hundred seventy-two million, six hundred fifty-six thousand, ninety-one".