856690758722 has 10 divisors (see below), whose sum is σ = 1286626529343. Its totient is φ = 427815904232.

The previous prime is 856690758689. The next prime is 856690758727. The reversal of 856690758722 is 227857096658.

It can be written as a sum of positive squares in 3 ways, for example, as 851414043841 + 5276714881 = 922721^2 + 72641^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=654481.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856690758727) by changing a digit.

It is a polite number, since it can be written in 4 ways as a sum of consecutive naturals, for example, 1058949854 + ... + 1058950662.

Almost surely, 2^856690758722 is an apocalyptic number.

856690758722 is a deficient number, since it is larger than the sum of its proper divisors (429935770621).

856690758722 is an frugal number, since it uses more digits than its factorization.

856690758722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238 (or 811 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 65.

The spelling of 856690758722 in words is "eight hundred fifty-six billion, six hundred ninety million, seven hundred fifty-eight thousand, seven hundred twenty-two".