66166117604 has 24 divisors (see below), whose sum is σ = 116867681280. Its totient is φ = 32776089696.

The previous prime is 66166117601. The next prime is 66166117609. The reversal of 66166117604 is 40671166166.

It is not an unprimeable number, because it can be changed into a prime (66166117601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268319 + ... + 452025.

It is an arithmetic number, because the mean of its divisors is an integer number (4869486720).

Almost surely, 2^66166117604 is an apocalyptic number.

It is an amenable number.

66166117604 is a deficient number, since it is larger than the sum of its proper divisors (50701563676).

66166117604 is a wasteful number, since it uses less digits than its factorization.

66166117604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184547 (or 184545 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 66166117604 in words is "sixty-six billion, one hundred sixty-six million, one hundred seventeen thousand, six hundred four".