166549665 has 8 divisors (see below), whose sum is σ = 266479488. Its totient is φ = 88826480.

The previous prime is 166549589. The next prime is 166549699. The reversal of 166549665 is 566945661.

166549665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166549665 - 2¹⁸ = 166287521 is a prime.

It is a super-2 number, since 2×166549665² = 55477581823224450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5551641 + ... + 5551670.

It is an arithmetic number, because the mean of its divisors is an integer number (33309936).

Almost surely, 2^166549665 is an apocalyptic number.

166549665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166549665 is a deficient number, since it is larger than the sum of its proper divisors (99929823).

166549665 is a wasteful number, since it uses less digits than its factorization.

166549665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11103319.

The product of its digits is 1166400, while the sum is 48.

The square root of 166549665 is about 12905.4122367323. The cubic root of 166549665 is about 550.1924010060.

The spelling of 166549665 in words is "one hundred sixty-six million, five hundred forty-nine thousand, six hundred sixty-five".