166138770 has 32 divisors (see below), whose sum is σ = 455695488. Its totient is φ = 37974528.

The previous prime is 166138759. The next prime is 166138771. The reversal of 166138770 is 77831661.

166138770 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 2×166138770² = 55204181794225800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (166138771) 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, 395359 + ... + 395778.

It is an arithmetic number, because the mean of its divisors is an integer number (14240484).

Almost surely, 2^166138770 is an apocalyptic number.

166138770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166138770 is an abundant number, since it is smaller than the sum of its proper divisors (289556718).

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

166138770 is a wasteful number, since it uses less digits than its factorization.

166138770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 791154.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 166138770 is about 12889.4829221346. The cubic root of 166138770 is about 549.7395681618.

The spelling of 166138770 in words is "one hundred sixty-six million, one hundred thirty-eight thousand, seven hundred seventy".