166165506 has 40 divisors (see below), whose sum is σ = 400979964. Its totient is φ = 51127200.

The previous prime is 166165481. The next prime is 166165523. The reversal of 166165506 is 605561661.

166165506 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 153140625 + 13024881 = 12375^2 + 3609^2 .

It is a super-2 number, since 2×166165506² = 55221950768472072, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 37345 + ... + 41556.

Almost surely, 2^166165506 is an apocalyptic number.

166165506 is an abundant number, since it is smaller than the sum of its proper divisors (234814458).

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

166165506 is a wasteful number, since it uses less digits than its factorization.

166165506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78928 (or 78919 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 166165506 is about 12890.5200050270. The cubic root of 166165506 is about 549.7690556574.

It can be divided in two parts, 16616 and 5506, that added together give a palindrome (22122).

The spelling of 166165506 in words is "one hundred sixty-six million, one hundred sixty-five thousand, five hundred six".