66980910868 has 12 divisors (see below), whose sum is σ = 122312967840. Its totient is φ = 32034348632.

The previous prime is 66980910851. The next prime is 66980910883. The reversal of 66980910868 is 86801908966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364026598 + ... + 364026781.

It is an arithmetic number, because the mean of its divisors is an integer number (10192747320).

Almost surely, 2^66980910868 is an apocalyptic number.

It is an amenable number.

66980910868 is a deficient number, since it is larger than the sum of its proper divisors (55332056972).

66980910868 is a wasteful number, since it uses less digits than its factorization.

66980910868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728053406 (or 728053404 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 61.

The spelling of 66980910868 in words is "sixty-six billion, nine hundred eighty million, nine hundred ten thousand, eight hundred sixty-eight".