166156506 has 12 divisors (see below), whose sum is σ = 360005802. Its totient is φ = 55385496.

The previous prime is 166156499. The next prime is 166156547. The reversal of 166156506 is 605651661.

It can be written as a sum of positive squares in only one way, i.e., 113230881 + 52925625 = 10641^2 + 7275^2 .

It is a super-2 number, since 2×166156506² = 55215968972256072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4615441 + ... + 4615476.

Almost surely, 2^166156506 is an apocalyptic number.

166156506 is an abundant number, since it is smaller than the sum of its proper divisors (193849296).

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

166156506 is a wasteful number, since it uses less digits than its factorization.

166156506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9230925 (or 9230922 counting only the distinct ones).

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

The square root of 166156506 is about 12890.1709065474. The cubic root of 166156506 is about 549.7591297890.

The spelling of 166156506 in words is "one hundred sixty-six million, one hundred fifty-six thousand, five hundred six".