861708136144 has 20 divisors (see below), whose sum is σ = 1676211153120. Its totient is φ = 429137516000.

The previous prime is 861708136129. The next prime is 861708136189. The reversal of 861708136144 is 441631807168.

It is a happy number.

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 3 ways as a sum of consecutive naturals, for example, 107280364 + ... + 107288395.

It is an arithmetic number, because the mean of its divisors is an integer number (83810557656).

Almost surely, 2^861708136144 is an apocalyptic number.

It is an amenable number.

861708136144 is a deficient number, since it is larger than the sum of its proper divisors (814503016976).

861708136144 is a wasteful number, since it uses less digits than its factorization.

861708136144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214569018 (or 214569012 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 861708136144 in words is "eight hundred sixty-one billion, seven hundred eight million, one hundred thirty-six thousand, one hundred forty-four".