166655601 has 24 divisors (see below), whose sum is σ = 276818880. Its totient is φ = 94641696.

The previous prime is 166655581. The next prime is 166655627. The reversal of 166655601 is 106556661.

It is not a de Polignac number, because 166655601 - 2⁶ = 166655537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166655501) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2155 + ... + 18383.

It is an arithmetic number, because the mean of its divisors is an integer number (11534120).

Almost surely, 2^166655601 is an apocalyptic number.

It is an amenable number.

166655601 is a deficient number, since it is larger than the sum of its proper divisors (110163279).

166655601 is a wasteful number, since it uses less digits than its factorization.

166655601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16405 (or 16402 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 166655601 is about 12909.5159088170. The cubic root of 166655601 is about 550.3090285375.

The spelling of 166655601 in words is "one hundred sixty-six million, six hundred fifty-five thousand, six hundred one".