66922407656 has 24 divisors (see below), whose sum is σ = 135137111970. Its totient is φ = 30886047456.

The previous prime is 66922407649. The next prime is 66922407667. The reversal of 66922407656 is 65670422966.

It can be written as a sum of positive squares in only one way, i.e., 64348468900 + 2573938756 = 253670^2 + 50734^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66922407598 and 66922407607.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2625485 + ... + 2650851.

Almost surely, 2^66922407656 is an apocalyptic number.

It is an amenable number.

66922407656 is an abundant number, since it is smaller than the sum of its proper divisors (68214704314).

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

66922407656 is an frugal number, since it uses more digits than its factorization.

66922407656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50753 (or 25382 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 53.

The spelling of 66922407656 in words is "sixty-six billion, nine hundred twenty-two million, four hundred seven thousand, six hundred fifty-six".