856970478529 has 27 divisors (see below), whose sum is σ = 984963868609. Its totient is φ = 744988060520.

The previous prime is 856970478521. The next prime is 856970478547. The reversal of 856970478529 is 925874079658.

The square root of 856970478529 is 925727.

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

It is not a de Polignac number, because 856970478529 - 2³ = 856970478521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856970478521) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 234207102 + ... + 234210760.

Almost surely, 2^856970478529 is an apocalyptic number.

856970478529 is the 925727-th square number.

856970478529 is the 462864-th centered octagonal number.

It is an amenable number.

856970478529 is a deficient number, since it is larger than the sum of its proper divisors (127993390080).

856970478529 is an frugal number, since it uses more digits than its factorization.

856970478529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7386 (or 3693 counting only the distinct ones).

The product of its (nonzero) digits is 304819200, while the sum is 70.

The spelling of 856970478529 in words is "eight hundred fifty-six billion, nine hundred seventy million, four hundred seventy-eight thousand, five hundred twenty-nine".