856704052025 has 24 divisors (see below), whose sum is σ = 1078860290040. Its totient is φ = 674753699840.

The previous prime is 856704051997. The next prime is 856704052063. The reversal of 856704052025 is 520250407658.

It can be written as a sum of positive squares in 12 ways, for example, as 403414252201 + 453289799824 = 635149^2 + 673268^2 .

It is not a de Polignac number, because 856704052025 - 2¹² = 856704047929 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 307832 + ... + 1344681.

It is an arithmetic number, because the mean of its divisors is an integer number (44952512085).

Almost surely, 2^856704052025 is an apocalyptic number.

It is an amenable number.

856704052025 is a deficient number, since it is larger than the sum of its proper divisors (222156238015).

856704052025 is a wasteful number, since it uses less digits than its factorization.

856704052025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652845 (or 1652840 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 44.

The spelling of 856704052025 in words is "eight hundred fifty-six billion, seven hundred four million, fifty-two thousand, twenty-five".