166409380 has 12 divisors (see below), whose sum is σ = 349459740. Its totient is φ = 66563744.

The previous prime is 166409371. The next prime is 166409381. The reversal of 166409380 is 83904661.

166409380 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 43243776 + 123165604 = 6576^2 + 11098^2 .

It is not an unprimeable number, because it can be changed into a prime (166409381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4160215 + ... + 4160254.

It is an arithmetic number, because the mean of its divisors is an integer number (29121645).

Almost surely, 2^166409380 is an apocalyptic number.

166409380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166409380 is an abundant number, since it is smaller than the sum of its proper divisors (183050360).

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

166409380 is a wasteful number, since it uses less digits than its factorization.

166409380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8320478 (or 8320476 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 166409380 is about 12899.9759689699. The cubic root of 166409380 is about 550.0378816883.

The spelling of 166409380 in words is "one hundred sixty-six million, four hundred nine thousand, three hundred eighty".