166091904 has 256 divisors, whose sum is σ = 568425600. Its totient is φ = 47185920.

The previous prime is 166091899. The next prime is 166091923. The reversal of 166091904 is 409190661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 646144 + ... + 646400.

Almost surely, 2^166091904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166091904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284212800).

166091904 is an abundant number, since it is smaller than the sum of its proper divisors (402333696).

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

166091904 is a wasteful number, since it uses less digits than its factorization.

166091904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308 (or 290 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 166091904 is about 12887.6648001102. The cubic root of 166091904 is about 549.6878713833.

The spelling of 166091904 in words is "one hundred sixty-six million, ninety-one thousand, nine hundred four".