851563531204 has 27 divisors (see below), whose sum is σ = 1495451095047. Its totient is φ = 424296977184.

The previous prime is 851563531171. The next prime is 851563531277. The reversal of 851563531204 is 402135365158.

The square root of 851563531204 is 922802.

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

It can be written as a sum of positive squares in 4 ways, for example, as 79976971204 + 771586560000 = 282802^2 + 878400^2 .

It is a Duffinian number.

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, 688409674 + ... + 688410910.

Almost surely, 2^851563531204 is an apocalyptic number.

851563531204 is the 922802-nd square number.

It is an amenable number.

851563531204 is a deficient number, since it is larger than the sum of its proper divisors (643887563843).

851563531204 is an frugal number, since it uses more digits than its factorization.

851563531204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224 (or 1612 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 851563531204 in words is "eight hundred fifty-one billion, five hundred sixty-three million, five hundred thirty-one thousand, two hundred four".