66642062420 has 24 divisors (see below), whose sum is σ = 140250614784. Its totient is φ = 26599247136.

The previous prime is 66642062401. The next prime is 66642062489. The reversal of 66642062420 is 2426024666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3589124 + ... + 3607643.

It is an arithmetic number, because the mean of its divisors is an integer number (5843775616).

Almost surely, 2^66642062420 is an apocalyptic number.

It is an amenable number.

66642062420 is an abundant number, since it is smaller than the sum of its proper divisors (73608552364).

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

66642062420 is a wasteful number, since it uses less digits than its factorization.

66642062420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7197239 (or 7197237 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 66642062420 in words is "sixty-six billion, six hundred forty-two million, sixty-two thousand, four hundred twenty".