204539653531 has 16 divisors (see below), whose sum is σ = 207905955840. Its totient is φ = 201203533440.

The previous prime is 204539653469. The next prime is 204539653567. The reversal of 204539653531 is 135356935402.

It is a cyclic number.

It is not a de Polignac number, because 204539653531 - 2¹⁵ = 204539620763 is a prime.

It is a super-2 number, since 2×204539653531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204539653231) 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, 21573450 + ... + 21582928.

It is an arithmetic number, because the mean of its divisors is an integer number (12994122240).

Almost surely, 2^204539653531 is an apocalyptic number.

204539653531 is a deficient number, since it is larger than the sum of its proper divisors (3366302309).

204539653531 is a wasteful number, since it uses less digits than its factorization.

204539653531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11034.

The product of its (nonzero) digits is 1458000, while the sum is 46.

The spelling of 204539653531 in words is "two hundred four billion, five hundred thirty-nine million, six hundred fifty-three thousand, five hundred thirty-one".