861444256908 has 24 divisors (see below), whose sum is σ = 2024708403312. Its totient is φ = 285052113664.

The previous prime is 861444256889. The next prime is 861444256919. The reversal of 861444256908 is 809652444168.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261994785 + ... + 261998072.

It is an arithmetic number, because the mean of its divisors is an integer number (84362850138).

Almost surely, 2^861444256908 is an apocalyptic number.

It is an amenable number.

861444256908 is an abundant number, since it is smaller than the sum of its proper divisors (1163264146404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861444256908 is a wasteful number, since it uses less digits than its factorization.

861444256908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523993001 (or 523992999 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 57.

The spelling of 861444256908 in words is "eight hundred sixty-one billion, four hundred forty-four million, two hundred fifty-six thousand, nine hundred eight".