66205917186 has 16 divisors (see below), whose sum is σ = 132415344864. Its totient is φ = 22068053984.

The previous prime is 66205917179. The next prime is 66205917209. The reversal of 66205917186 is 68171950266.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142870 + ... + 390926.

It is an arithmetic number, because the mean of its divisors is an integer number (8275959054).

Almost surely, 2^66205917186 is an apocalyptic number.

66205917186 is an abundant number, since it is smaller than the sum of its proper divisors (66209427678).

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

66205917186 is a wasteful number, since it uses less digits than its factorization.

66205917186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292545.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 66205917186 in words is "sixty-six billion, two hundred five million, nine hundred seventeen thousand, one hundred eighty-six".