166516651 has 12 divisors (see below), whose sum is σ = 194169360. Its totient is φ = 142385040.

The previous prime is 166516643. The next prime is 166516657. The reversal of 166516651 is 156615661.

It is not a de Polignac number, because 166516651 - 2³ = 166516643 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166516651.

It is not an unprimeable number, because it can be changed into a prime (166516657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17641 + ... + 25381.

It is an arithmetic number, because the mean of its divisors is an integer number (16180780).

Almost surely, 2^166516651 is an apocalyptic number.

166516651 is a deficient number, since it is larger than the sum of its proper divisors (27652709).

166516651 is an equidigital number, since it uses as much as digits as its factorization.

166516651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8194 (or 8187 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 166516651 is about 12904.1330975777. The cubic root of 166516651 is about 550.1560449792.

The spelling of 166516651 in words is "one hundred sixty-six million, five hundred sixteen thousand, six hundred fifty-one".