861546316940 has 24 divisors (see below), whose sum is σ = 1809271649472. Its totient is φ = 344613882240.

The previous prime is 861546316931. The next prime is 861546316997. The reversal of 861546316940 is 49613645168.

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, 1500125 + ... + 1993355.

It is an arithmetic number, because the mean of its divisors is an integer number (75386318728).

Almost surely, 2^861546316940 is an apocalyptic number.

It is an amenable number.

861546316940 is an abundant number, since it is smaller than the sum of its proper divisors (947725332532).

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

861546316940 is a wasteful number, since it uses less digits than its factorization.

861546316940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580577 (or 580575 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 53.

The spelling of 861546316940 in words is "eight hundred sixty-one billion, five hundred forty-six million, three hundred sixteen thousand, nine hundred forty".