166765690 has 32 divisors (see below), whose sum is σ = 369452160. Its totient is φ = 52778304.

The previous prime is 166765661. The next prime is 166765691. The reversal of 166765690 is 96567661.

166765690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166765690² = 55621590722352200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 166765690.

It is not an unprimeable number, because it can be changed into a prime (166765691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90720 + ... + 92539.

It is an arithmetic number, because the mean of its divisors is an integer number (11545380).

Almost surely, 2^166765690 is an apocalyptic number.

166765690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166765690 is an abundant number, since it is smaller than the sum of its proper divisors (202686470).

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

166765690 is a wasteful number, since it uses less digits than its factorization.

166765690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183286.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 166765690 is about 12913.7790750810. The cubic root of 166765690 is about 550.4301758521.

It can be divided in two parts, 16676 and 5690, that added together give a triangular number (22366 = T₂₁₁).

The spelling of 166765690 in words is "one hundred sixty-six million, seven hundred sixty-five thousand, six hundred ninety".