166642664 has 8 divisors (see below), whose sum is σ = 312455010. Its totient is φ = 83321328.

The previous prime is 166642661. The next prime is 166642691. The reversal of 166642664 is 466246661.

It can be written as a sum of positive squares in only one way, i.e., 161544100 + 5098564 = 12710^2 + 2258^2 .

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

It is not an unprimeable number, because it can be changed into a prime (166642661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10415159 + ... + 10415174.

Almost surely, 2^166642664 is an apocalyptic number.

It is an amenable number.

166642664 is a deficient number, since it is larger than the sum of its proper divisors (145812346).

166642664 is a wasteful number, since it uses less digits than its factorization.

166642664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20830339 (or 20830335 counting only the distinct ones).

The product of its digits is 248832, while the sum is 41.

The square root of 166642664 is about 12909.0148346030. The cubic root of 166642664 is about 550.2947885277.

The spelling of 166642664 in words is "one hundred sixty-six million, six hundred forty-two thousand, six hundred sixty-four".