66461439908524 has 24 divisors (see below), whose sum is σ = 120061534791296. Its totient is φ = 32158182816000.

The previous prime is 66461439908503. The next prime is 66461439908527. The reversal of 66461439908524 is 42580993416466.

It is a self number, because there is not a number n which added to its sum of digits gives 66461439908524.

It is not an unprimeable number, because it can be changed into a prime (66461439908527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2141914 + ... + 11726494.

Almost surely, 2^{66461439908524} is an apocalyptic number.

It is an amenable number.

66461439908524 is a deficient number, since it is larger than the sum of its proper divisors (53600094882772).

66461439908524 is a wasteful number, since it uses less digits than its factorization.

66461439908524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9640537 (or 9640535 counting only the distinct ones).

The product of its (nonzero) digits is 268738560, while the sum is 67.

The spelling of 66461439908524 in words is "sixty-six trillion, four hundred sixty-one billion, four hundred thirty-nine million, nine hundred eight thousand, five hundred twenty-four".