12981761668 has 12 divisors (see below), whose sum is σ = 22720249552. Its totient is φ = 6490261800.

The previous prime is 12981761539. The next prime is 12981761687. The reversal of 12981761668 is 86616718921.

It is a super-2 number, since 2×12981761668² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105858 + ... + 192793.

Almost surely, 2^12981761668 is an apocalyptic number.

It is an amenable number.

12981761668 is a deficient number, since it is larger than the sum of its proper divisors (9738487884).

12981761668 is a wasteful number, since it uses less digits than its factorization.

12981761668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309522 (or 309520 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 55.

The spelling of 12981761668 in words is "twelve billion, nine hundred eighty-one million, seven hundred sixty-one thousand, six hundred sixty-eight".