66406442660404 has 48 divisors (see below), whose sum is σ = 144893639278080. Its totient is φ = 25871415838560.

The previous prime is 66406442660399. The next prime is 66406442660431. The reversal of 66406442660404 is 40406624460466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1433059 + ... + 11613205.

It is an arithmetic number, because the mean of its divisors is an integer number (3018617484960).

Almost surely, 2^{66406442660404} is an apocalyptic number.

It is an amenable number.

66406442660404 is an abundant number, since it is smaller than the sum of its proper divisors (78487196617676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66406442660404 is a wasteful number, since it uses less digits than its factorization.

66406442660404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10201348 (or 10201346 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 52.

The spelling of 66406442660404 in words is "sixty-six trillion, four hundred six billion, four hundred forty-two million, six hundred sixty thousand, four hundred four".