166640626 has 16 divisors (see below), whose sum is σ = 252115488. Its totient is φ = 82605600.

The previous prime is 166640611. The next prime is 166640651. The reversal of 166640626 is 626046661.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139086 + ... + 140278.

It is an arithmetic number, because the mean of its divisors is an integer number (15757218).

Almost surely, 2^166640626 is an apocalyptic number.

166640626 is a deficient number, since it is larger than the sum of its proper divisors (85474862).

166640626 is a wasteful number, since it uses less digits than its factorization.

166640626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 166640626 is about 12908.9358972767. The cubic root of 166640626 is about 550.2925451940.

The spelling of 166640626 in words is "one hundred sixty-six million, six hundred forty thousand, six hundred twenty-six".