204537697979 has 4 divisors (see below), whose sum is σ = 206523500976. Its totient is φ = 202551894984.

The previous prime is 204537697957. The next prime is 204537697999. The reversal of 204537697979 is 979796735402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204537697979 - 2²⁰ = 204536649403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204537697999) 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, 992901344 + ... + 992901549.

It is an arithmetic number, because the mean of its divisors is an integer number (51630875244).

Almost surely, 2^204537697979 is an apocalyptic number.

204537697979 is a deficient number, since it is larger than the sum of its proper divisors (1985802997).

204537697979 is a wasteful number, since it uses less digits than its factorization.

204537697979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1985802996.

The product of its (nonzero) digits is 180033840, while the sum is 68.

The spelling of 204537697979 in words is "two hundred four billion, five hundred thirty-seven million, six hundred ninety-seven thousand, nine hundred seventy-nine".