166155001 has 4 divisors (see below), whose sum is σ = 170207604. Its totient is φ = 162102400.

The previous prime is 166154987. The next prime is 166155043. The reversal of 166155001 is 100551661.

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 11799225 + 154355776 = 3435^2 + 12424^2 .

It is a cyclic number.

It is not a de Polignac number, because 166155001 - 2⁵ = 166154969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166155401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2026240 + ... + 2026321.

It is an arithmetic number, because the mean of its divisors is an integer number (42551901).

Almost surely, 2^166155001 is an apocalyptic number.

It is an amenable number.

166155001 is a deficient number, since it is larger than the sum of its proper divisors (4052603).

166155001 is an equidigital number, since it uses as much as digits as its factorization.

166155001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052602.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 166155001 is about 12890.1125286011. The cubic root of 166155001 is about 549.7574699283.

The spelling of 166155001 in words is "one hundred sixty-six million, one hundred fifty-five thousand, one".