166501556164 has 12 divisors (see below), whose sum is σ = 291430046124. Its totient is φ = 83235828704.

The previous prime is 166501556141. The next prime is 166501556279. The reversal of 166501556164 is 461655105661.

It can be written as a sum of positive squares in 2 ways, for example, as 1834408900 + 164667147264 = 42830^2 + 405792^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3712267 + ... + 3756850.

It is an arithmetic number, because the mean of its divisors is an integer number (24285837177).

Almost surely, 2^166501556164 is an apocalyptic number.

It is an amenable number.

166501556164 is a deficient number, since it is larger than the sum of its proper divisors (124928489960).

166501556164 is a wasteful number, since it uses less digits than its factorization.

166501556164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7474694 (or 7474692 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 46.

The spelling of 166501556164 in words is "one hundred sixty-six billion, five hundred one million, five hundred fifty-six thousand, one hundred sixty-four".