166601388 has 24 divisors (see below), whose sum is σ = 389190592. Its totient is φ = 55468944.

The previous prime is 166601381. The next prime is 166601389. The reversal of 166601388 is 883106661.

166601388 is nontrivially palindromic in base 5.

166601388 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (166601381) 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, 3231 + ... + 18537.

Almost surely, 2^166601388 is an apocalyptic number.

It is an amenable number.

166601388 is an abundant number, since it is smaller than the sum of its proper divisors (222589204).

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

166601388 is a wasteful number, since it uses less digits than its factorization.

166601388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16221 (or 16219 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 166601388 is about 12907.4160078615. The cubic root of 166601388 is about 550.2493502973.

The spelling of 166601388 in words is "one hundred sixty-six million, six hundred one thousand, three hundred eighty-eight".