12666781564 has 6 divisors (see below), whose sum is σ = 22166867744. Its totient is φ = 6333390780.

The previous prime is 12666781541. The next prime is 12666781573. The reversal of 12666781564 is 46518766621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1583347692 + ... + 1583347699.

Almost surely, 2^12666781564 is an apocalyptic number.

It is an amenable number.

12666781564 is a deficient number, since it is larger than the sum of its proper divisors (9500086180).

12666781564 is a wasteful number, since it uses less digits than its factorization.

12666781564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3166695395 (or 3166695393 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 52.

The spelling of 12666781564 in words is "twelve billion, six hundred sixty-six million, seven hundred eighty-one thousand, five hundred sixty-four".