166615001 has 4 divisors (see below), whose sum is σ = 190417152. Its totient is φ = 142812852.

The previous prime is 166614979. The next prime is 166615003. The reversal of 166615001 is 100516661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100516661 = 7 ⋅14359523.

It is not a de Polignac number, because 166615001 - 2²² = 162420697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166615003) 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, 11901065 + ... + 11901078.

It is an arithmetic number, because the mean of its divisors is an integer number (47604288).

Almost surely, 2^166615001 is an apocalyptic number.

It is an amenable number.

166615001 is a deficient number, since it is larger than the sum of its proper divisors (23802151).

166615001 is an equidigital number, since it uses as much as digits as its factorization.

166615001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23802150.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 166615001 is about 12907.9433295936. The cubic root of 166615001 is about 550.2643368479.

The spelling of 166615001 in words is "one hundred sixty-six million, six hundred fifteen thousand, one".