66988203968 has 28 divisors (see below), whose sum is σ = 151919677872. Its totient is φ = 28709230080.

The previous prime is 66988203959. The next prime is 66988204027. The reversal of 66988203968 is 86930288966.

It is a tau number, because it is divible by the number of its divisors (28).

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, 74763173 + ... + 74764068.

Almost surely, 2^66988203968 is an apocalyptic number.

It is an amenable number.

66988203968 is an abundant number, since it is smaller than the sum of its proper divisors (84931473904).

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

66988203968 is a wasteful number, since it uses less digits than its factorization.

66988203968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149527260 (or 149527250 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 65.

The spelling of 66988203968 in words is "sixty-six billion, nine hundred eighty-eight million, two hundred three thousand, nine hundred sixty-eight".