66975486615 has 24 divisors (see below), whose sum is σ = 116611447680. Its totient is φ = 35560073664.

The previous prime is 66975486563. The next prime is 66975486637. The reversal of 66975486615 is 51668457966.

66975486615 is a `hidden beast` number, since 6 + 6 + 9 + 7 + 5 + 4 + 8 + 6 + 615 = 666.

66975486615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66975486615 - 2⁸ = 66975486359 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3327060 + ... + 3347129.

It is an arithmetic number, because the mean of its divisors is an integer number (4858810320).

Almost surely, 2^66975486615 is an apocalyptic number.

66975486615 is a deficient number, since it is larger than the sum of its proper divisors (49635961065).

66975486615 is a wasteful number, since it uses less digits than its factorization.

66975486615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6674423 (or 6674420 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 66975486615 in words is "sixty-six billion, nine hundred seventy-five million, four hundred eighty-six thousand, six hundred fifteen".