856642987610 has 32 divisors (see below), whose sum is σ = 1565364880512. Its totient is φ = 337492552000.

The previous prime is 856642987579. The next prime is 856642987621. The reversal of 856642987610 is 16789246658.

It is a super-2 number, since 2×856642987610² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 2128766 + ... + 2498985.

It is an arithmetic number, because the mean of its divisors is an integer number (48917652516).

Almost surely, 2^856642987610 is an apocalyptic number.

856642987610 is a deficient number, since it is larger than the sum of its proper divisors (708721892902).

856642987610 is a wasteful number, since it uses less digits than its factorization.

856642987610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4628038.

The product of its (nonzero) digits is 34836480, while the sum is 62.

The spelling of 856642987610 in words is "eight hundred fifty-six billion, six hundred forty-two million, nine hundred eighty-seven thousand, six hundred ten".