166121501 has 32 divisors (see below), whose sum is σ = 219598848. Its totient is φ = 121927680.

The previous prime is 166121497. The next prime is 166121507. The reversal of 166121501 is 105121661.

166121501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 166121501 - 2² = 166121497 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166121507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112196 + ... + 113666.

It is an arithmetic number, because the mean of its divisors is an integer number (6862464).

Almost surely, 2^166121501 is an apocalyptic number.

It is an amenable number.

166121501 is a deficient number, since it is larger than the sum of its proper divisors (53477347).

166121501 is a wasteful number, since it uses less digits than its factorization.

166121501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1581.

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 166121501 is about 12888.8130174970. The cubic root of 166121501 is about 549.7205202668.

The spelling of 166121501 in words is "one hundred sixty-six million, one hundred twenty-one thousand, five hundred one".