66978013252 has 24 divisors (see below), whose sum is σ = 117700938432. Its totient is φ = 33349466400.

The previous prime is 66978013241. The next prime is 66978013273. The reversal of 66978013252 is 25231087966.

It is a junction number, because it is equal to n+sod(n) for n = 66978013196 and 66978013205.

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, 891427 + ... + 963637.

It is an arithmetic number, because the mean of its divisors is an integer number (4904205768).

Almost surely, 2^66978013252 is an apocalyptic number.

It is an amenable number.

66978013252 is a deficient number, since it is larger than the sum of its proper divisors (50722925180).

66978013252 is a wasteful number, since it uses less digits than its factorization.

66978013252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73179 (or 73177 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 66978013252 in words is "sixty-six billion, nine hundred seventy-eight million, thirteen thousand, two hundred fifty-two".