856381638002 has 8 divisors (see below), whose sum is σ = 1401351771312. Its totient is φ = 389264380900.

The previous prime is 856381637971. The next prime is 856381638059. The reversal of 856381638002 is 200836183658.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 19463219024 + ... + 19463219067.

It is an arithmetic number, because the mean of its divisors is an integer number (175168971414).

Almost surely, 2^856381638002 is an apocalyptic number.

856381638002 is a deficient number, since it is larger than the sum of its proper divisors (544970133310).

856381638002 is a wasteful number, since it uses less digits than its factorization.

856381638002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38926438104.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The spelling of 856381638002 in words is "eight hundred fifty-six billion, three hundred eighty-one million, six hundred thirty-eight thousand, two".