856854201902 has 16 divisors (see below), whose sum is σ = 1325371686912. Its totient is φ = 415240639320.

The previous prime is 856854201877. The next prime is 856854201919. The reversal of 856854201902 is 209102458658.

It is a happy number.

It is a super-2 number, since 2×856854201902² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44240174 + ... + 44259537.

It is an arithmetic number, because the mean of its divisors is an integer number (82835730432).

Almost surely, 2^856854201902 is an apocalyptic number.

856854201902 is a deficient number, since it is larger than the sum of its proper divisors (468517485010).

856854201902 is a wasteful number, since it uses less digits than its factorization.

856854201902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88499863.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 856854201902 in words is "eight hundred fifty-six billion, eight hundred fifty-four million, two hundred one thousand, nine hundred two".