166015001 has 4 divisors (see below), whose sum is σ = 166072500. Its totient is φ = 165957504.

The previous prime is 166014997. The next prime is 166015009. The reversal of 166015001 is 100510661.

It is a happy number.

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 92929600 + 73085401 = 9640^2 + 8549^2 .

It is a cyclic number.

It is not a de Polignac number, because 166015001 - 2² = 166014997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166015009) 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, 24176 + ... + 30273.

It is an arithmetic number, because the mean of its divisors is an integer number (41518125).

Almost surely, 2^166015001 is an apocalyptic number.

It is an amenable number.

166015001 is a deficient number, since it is larger than the sum of its proper divisors (57499).

166015001 is an equidigital number, since it uses as much as digits as its factorization.

166015001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57498.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 166015001 is about 12884.6808652756. The cubic root of 166015001 is about 549.6030204237.

Adding to 166015001 its reverse (100510661), we get a palindrome (266525662).

It can be divided in two parts, 1660 and 15001, that added together give a palindrome (16661).

The spelling of 166015001 in words is "one hundred sixty-six million, fifteen thousand, one".