12311561996 has 6 divisors (see below), whose sum is σ = 21545233500. Its totient is φ = 6155780996.

The previous prime is 12311561981. The next prime is 12311562007. The reversal of 12311561996 is 69916511321.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1538945246 + ... + 1538945253.

It is an arithmetic number, because the mean of its divisors is an integer number (3590872250).

Almost surely, 2^12311561996 is an apocalyptic number.

It is an amenable number.

12311561996 is a deficient number, since it is larger than the sum of its proper divisors (9233671504).

12311561996 is a wasteful number, since it uses less digits than its factorization.

12311561996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3077890503 (or 3077890501 counting only the distinct ones).

The product of its digits is 87480, while the sum is 44.

The spelling of 12311561996 in words is "twelve billion, three hundred eleven million, five hundred sixty-one thousand, nine hundred ninety-six".