166601515 has 4 divisors (see below), whose sum is σ = 199921824. Its totient is φ = 133281208.

The previous prime is 166601507. The next prime is 166601531. The reversal of 166601515 is 515106661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515106661 = 1051 ⋅490111.

It is a cyclic number.

It is not a de Polignac number, because 166601515 - 2³ = 166601507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16660147 + ... + 16660156.

It is an arithmetic number, because the mean of its divisors is an integer number (49980456).

Almost surely, 2^166601515 is an apocalyptic number.

166601515 is a deficient number, since it is larger than the sum of its proper divisors (33320309).

166601515 is an equidigital number, since it uses as much as digits as its factorization.

166601515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33320308.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 166601515 is about 12907.4209275130. The cubic root of 166601515 is about 550.2494901154.

The spelling of 166601515 in words is "one hundred sixty-six million, six hundred one thousand, five hundred fifteen".