166555626 has 16 divisors (see below), whose sum is σ = 333754464. Its totient is φ = 55411344.

The previous prime is 166555607. The next prime is 166555633. The reversal of 166555626 is 626555661.

166555626 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 23401 + ... + 29676.

It is an arithmetic number, because the mean of its divisors is an integer number (20859654).

Almost surely, 2^166555626 is an apocalyptic number.

166555626 is an abundant number, since it is smaller than the sum of its proper divisors (167198838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166555626 is a wasteful number, since it uses less digits than its factorization.

166555626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53605.

The product of its digits is 324000, while the sum is 42.

The square root of 166555626 is about 12905.6431842818. The cubic root of 166555626 is about 550.1989649295.

It can be divided in two parts, 1665 and 55626, that added together give a triangular number (57291 = T₃₃₈).

The spelling of 166555626 in words is "one hundred sixty-six million, five hundred fifty-five thousand, six hundred twenty-six".