204891855633936 has 45 divisors (see below), whose sum is σ = 573413104467021. Its totient is φ = 68297227955136.

The previous prime is 204891855633919. The next prime is 204891855633953. The reversal of 204891855633936 is 639336558198402.

The square root of 204891855633936 is 14314044.

It is a perfect power (a square), and thus also a powerful number.

204891855633936 is a `hidden beast` number, since 2 + 0 + 4 + 8 + 9 + 1 + 8 + 556 + 3 + 39 + 36 = 666.

It is an interprime number because it is at equal distance from previous prime (204891855633919) and next prime (204891855633953).

It can be written as a sum of positive squares in only one way, i.e., 174634639203600 + 30257216430336 = 13214940^2 + 5500656^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 171172110 + ... + 172364946.

Almost surely, 2^{204891855633936} is an apocalyptic number.

204891855633936 is the 14314044-th square number.

It is an amenable number.

204891855633936 is an abundant number, since it is smaller than the sum of its proper divisors (368521248833085).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

204891855633936 is an frugal number, since it uses more digits than its factorization.

204891855633936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385688 (or 1192842 counting only the distinct ones).

The product of its (nonzero) digits is 1007769600, while the sum is 72.

The spelling of 204891855633936 in words is "two hundred four trillion, eight hundred ninety-one billion, eight hundred fifty-five million, six hundred thirty-three thousand, nine hundred thirty-six".