166165590 has 16 divisors (see below), whose sum is σ = 398797488. Its totient is φ = 44310816.

The previous prime is 166165567. The next prime is 166165591. The reversal of 166165590 is 95561661.

It is a super-3 number, since 3×166165590³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166165591) 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 7 ways as a sum of consecutive naturals, for example, 2769397 + ... + 2769456.

It is an arithmetic number, because the mean of its divisors is an integer number (24924843).

Almost surely, 2^166165590 is an apocalyptic number.

166165590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166165590 is an abundant number, since it is smaller than the sum of its proper divisors (232631898).

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

166165590 is a wasteful number, since it uses less digits than its factorization.

166165590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5538863.

The product of its (nonzero) digits is 48600, while the sum is 39.

The square root of 166165590 is about 12890.5232632349. The cubic root of 166165590 is about 549.7691482971.

The spelling of 166165590 in words is "one hundred sixty-six million, one hundred sixty-five thousand, five hundred ninety".