66377161566 has 12 divisors (see below), whose sum is σ = 143817183432. Its totient is φ = 22125720516.

The previous prime is 66377161547. The next prime is 66377161577. The reversal of 66377161566 is 66516177366.

66377161566 is a `hidden beast` number, since 6 + 6 + 3 + 7 + 71 + 6 + 1 + 566 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1843810026 + ... + 1843810061.

It is an arithmetic number, because the mean of its divisors is an integer number (11984765286).

Almost surely, 2^66377161566 is an apocalyptic number.

66377161566 is an abundant number, since it is smaller than the sum of its proper divisors (77440021866).

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

66377161566 is a wasteful number, since it uses less digits than its factorization.

66377161566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687620095 (or 3687620092 counting only the distinct ones).

The product of its digits is 5715360, while the sum is 54.

The spelling of 66377161566 in words is "sixty-six billion, three hundred seventy-seven million, one hundred sixty-one thousand, five hundred sixty-six".