166151401 has 4 divisors (see below), whose sum is σ = 178932292. Its totient is φ = 153370512.

The previous prime is 166151389. The next prime is 166151407. The reversal of 166151401 is 104151661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52707600 + 113443801 = 7260^2 + 10651^2 .

It is a cyclic number.

It is not a de Polignac number, because 166151401 - 2⁵ = 166151369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166151407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6390426 + ... + 6390451.

It is an arithmetic number, because the mean of its divisors is an integer number (44733073).

Almost surely, 2^166151401 is an apocalyptic number.

It is an amenable number.

166151401 is a deficient number, since it is larger than the sum of its proper divisors (12780891).

166151401 is a wasteful number, since it uses less digits than its factorization.

166151401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12780890.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 166151401 is about 12889.9728859296. The cubic root of 166151401 is about 549.7534994566.

The spelling of 166151401 in words is "one hundred sixty-six million, one hundred fifty-one thousand, four hundred one".