312171978866 has 32 divisors (see below), whose sum is σ = 523434700800. Its totient is φ = 138403374480.

The previous prime is 312171978863. The next prime is 312171978883. The reversal of 312171978866 is 668879171213.

It is a super-2 number, since 2×312171978866² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (312171978863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450695 + ... + 909653.

It is an arithmetic number, because the mean of its divisors is an integer number (16357334400).

Almost surely, 2^312171978866 is an apocalyptic number.

312171978866 is a deficient number, since it is larger than the sum of its proper divisors (211262721934).

312171978866 is a wasteful number, since it uses less digits than its factorization.

312171978866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459734.

The product of its digits is 6096384, while the sum is 59.

The spelling of 312171978866 in words is "three hundred twelve billion, one hundred seventy-one million, nine hundred seventy-eight thousand, eight hundred sixty-six".