66429904656 has 40 divisors (see below), whose sum is σ = 172129089184. Its totient is φ = 22076398080.

The previous prime is 66429904591. The next prime is 66429904663. The reversal of 66429904656 is 65640992466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66429904596 and 66429904605.

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, 2074681 + ... + 2106456.

Almost surely, 2^66429904656 is an apocalyptic number.

It is an amenable number.

66429904656 is an abundant number, since it is smaller than the sum of its proper divisors (105699184528).

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

66429904656 is a wasteful number, since it uses less digits than its factorization.

66429904656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4181479 (or 4181473 counting only the distinct ones).

The product of its (nonzero) digits is 16796160, while the sum is 57.

The spelling of 66429904656 in words is "sixty-six billion, four hundred twenty-nine million, nine hundred four thousand, six hundred fifty-six".