66820422462642 has 24 divisors (see below), whose sum is σ = 145062017350380. Its totient is φ = 22229714869920.

The previous prime is 66820422462587. The next prime is 66820422462653. The reversal of 66820422462642 is 24626422402866.

66820422462642 is a `hidden beast` number, since 6 + 6 + 8 + 2 + 0 + 4 + 2 + 2 + 4 + 626 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 60397284721761 + 6423137740881 = 7771569^2 + 2534391^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3646597609 + ... + 3646615932.

Almost surely, 2^{66820422462642} is an apocalyptic number.

66820422462642 is an abundant number, since it is smaller than the sum of its proper divisors (78241594887738).

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

66820422462642 is a wasteful number, since it uses less digits than its factorization.

66820422462642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7293214058 (or 7293214055 counting only the distinct ones).

The product of its (nonzero) digits is 21233664, while the sum is 54.

The spelling of 66820422462642 in words is "sixty-six trillion, eight hundred twenty billion, four hundred twenty-two million, four hundred sixty-two thousand, six hundred forty-two".