66620424642 has 16 divisors (see below), whose sum is σ = 133250017152. Its totient is φ = 22205280240.

The previous prime is 66620424631. The next prime is 66620424727. The reversal of 66620424642 is 24642402666.

It is a junction number, because it is equal to n+sod(n) for n = 66620424594 and 66620424603.

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, 285658 + ... + 463509.

It is an arithmetic number, because the mean of its divisors is an integer number (8328126072).

Almost surely, 2^66620424642 is an apocalyptic number.

66620424642 is an abundant number, since it is smaller than the sum of its proper divisors (66629592510).

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

66620424642 is a wasteful number, since it uses less digits than its factorization.

66620424642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763993.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 66620424642 in words is "sixty-six billion, six hundred twenty million, four hundred twenty-four thousand, six hundred forty-two".