66737774408 has 8 divisors (see below), whose sum is σ = 125133327030. Its totient is φ = 33368887200.

The previous prime is 66737774399. The next prime is 66737774431. The reversal of 66737774408 is 80447773766.

It can be written as a sum of positive squares in only one way, i.e., 65023980004 + 1713794404 = 254998^2 + 41398^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4171110893 + ... + 4171110908.

Almost surely, 2^66737774408 is an apocalyptic number.

It is an amenable number.

66737774408 is a deficient number, since it is larger than the sum of its proper divisors (58395552622).

66737774408 is a wasteful number, since it uses less digits than its factorization.

66737774408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8342221807 (or 8342221803 counting only the distinct ones).

The product of its (nonzero) digits is 33191424, while the sum is 59.

The spelling of 66737774408 in words is "sixty-six billion, seven hundred thirty-seven million, seven hundred seventy-four thousand, four hundred eight".