204253657678 has 16 divisors (see below), whose sum is σ = 350161663104. Its totient is φ = 87534147960.

The previous prime is 204253657661. The next prime is 204253657681. The reversal of 204253657678 is 876756352402.

It is a congruent number.

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, 168201 + ... + 660907.

It is an arithmetic number, because the mean of its divisors is an integer number (21885103944).

Almost surely, 2^204253657678 is an apocalyptic number.

204253657678 is a deficient number, since it is larger than the sum of its proper divisors (145908005426).

204253657678 is a wasteful number, since it uses less digits than its factorization.

204253657678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522327.

The product of its (nonzero) digits is 16934400, while the sum is 55.

The spelling of 204253657678 in words is "two hundred four billion, two hundred fifty-three million, six hundred fifty-seven thousand, six hundred seventy-eight".