66874425808 has 10 divisors (see below), whose sum is σ = 129569200034. Its totient is φ = 33437212896.

The previous prime is 66874425769. The next prime is 66874425817. The reversal of 66874425808 is 80852447866.

It can be written as a sum of positive squares in only one way, i.e., 66320670784 + 553755024 = 257528^2 + 23532^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2089825791 + ... + 2089825822.

Almost surely, 2^66874425808 is an apocalyptic number.

It is an amenable number.

66874425808 is a deficient number, since it is larger than the sum of its proper divisors (62694774226).

66874425808 is a wasteful number, since it uses less digits than its factorization.

66874425808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179651621 (or 4179651615 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 58.

The spelling of 66874425808 in words is "sixty-six billion, eight hundred seventy-four million, four hundred twenty-five thousand, eight hundred eight".