861908159205 has 64 divisors (see below), whose sum is σ = 1554290411520. Its totient is φ = 453089852928.

The previous prime is 861908159173. The next prime is 861908159227. The reversal of 861908159205 is 502951809168.

861908159205 is a `hidden beast` number, since 8 + 619 + 0 + 8 + 15 + 9 + 2 + 0 + 5 = 666.

It is not a de Polignac number, because 861908159205 - 2⁵ = 861908159173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15414879 + ... + 15470691.

It is an arithmetic number, because the mean of its divisors is an integer number (24285787680).

Almost surely, 2^861908159205 is an apocalyptic number.

It is an amenable number.

861908159205 is a deficient number, since it is larger than the sum of its proper divisors (692382252315).

861908159205 is a wasteful number, since it uses less digits than its factorization.

861908159205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57467 (or 57461 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 54.

The spelling of 861908159205 in words is "eight hundred sixty-one billion, nine hundred eight million, one hundred fifty-nine thousand, two hundred five".