166006651 has 4 divisors (see below), whose sum is σ = 166597704. Its totient is φ = 165415600.

The previous prime is 166006639. The next prime is 166006661. The reversal of 166006651 is 156600661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 156600661 = 7 ⋅22371523.

It is a cyclic number.

It is not a de Polignac number, because 166006651 - 2⁷ = 166006523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166006601) 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, 295105 + ... + 295666.

It is an arithmetic number, because the mean of its divisors is an integer number (41649426).

Almost surely, 2^166006651 is an apocalyptic number.

166006651 is a deficient number, since it is larger than the sum of its proper divisors (591053).

166006651 is an equidigital number, since it uses as much as digits as its factorization.

166006651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591052.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 166006651 is about 12884.3568329971. The cubic root of 166006651 is about 549.5938058705.

The spelling of 166006651 in words is "one hundred sixty-six million, six thousand, six hundred fifty-one".