166628751 has 24 divisors (see below), whose sum is σ = 237605040. Its totient is φ = 103743360.

The previous prime is 166628731. The next prime is 166628753. The reversal of 166628751 is 157826661.

It is not a de Polignac number, because 166628751 - 2⁹ = 166628239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166628753) 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 23 ways as a sum of consecutive naturals, for example, 82611 + ... + 84603.

It is an arithmetic number, because the mean of its divisors is an integer number (9900210).

Almost surely, 2^166628751 is an apocalyptic number.

166628751 is a deficient number, since it is larger than the sum of its proper divisors (70976289).

166628751 is a wasteful number, since it uses less digits than its factorization.

166628751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087 (or 2056 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The square root of 166628751 is about 12908.4759363761. The cubic root of 166628751 is about 550.2794733932.

The spelling of 166628751 in words is "one hundred sixty-six million, six hundred twenty-eight thousand, seven hundred fifty-one".