204253657679 has 4 divisors (see below), whose sum is σ = 204264760584. Its totient is φ = 204242554776.

The previous prime is 204253657661. The next prime is 204253657681. The reversal of 204253657679 is 976756352402.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-204253657679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204253657639) 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, 5523812 + ... + 5560665.

It is an arithmetic number, because the mean of its divisors is an integer number (51066190146).

Almost surely, 2^204253657679 is an apocalyptic number.

204253657679 is a deficient number, since it is larger than the sum of its proper divisors (11102905).

204253657679 is a wasteful number, since it uses less digits than its factorization.

204253657679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11102904.

The product of its (nonzero) digits is 19051200, while the sum is 56.

The spelling of 204253657679 in words is "two hundred four billion, two hundred fifty-three million, six hundred fifty-seven thousand, six hundred seventy-nine".