166655490 has 16 divisors (see below), whose sum is σ = 399973248. Its totient is φ = 44441456.

The previous prime is 166655443. The next prime is 166655491. The reversal of 166655490 is 94556661.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (166655491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2777562 + ... + 2777621.

It is an arithmetic number, because the mean of its divisors is an integer number (24998328).

Almost surely, 2^166655490 is an apocalyptic number.

166655490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166655490 is an abundant number, since it is smaller than the sum of its proper divisors (233317758).

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

166655490 is a wasteful number, since it uses less digits than its factorization.

166655490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555193.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 166655490 is about 12909.5116096621. The cubic root of 166655490 is about 550.3089063607.

It can be divided in two parts, 16665 and 5490, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 166655490 in words is "one hundred sixty-six million, six hundred fifty-five thousand, four hundred ninety".