166090820 has 48 divisors (see below), whose sum is σ = 415957248. Its totient is φ = 54468480.

The previous prime is 166090807. The next prime is 166090831. The reversal of 166090820 is 28090661.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22571 + ... + 29010.

It is an arithmetic number, because the mean of its divisors is an integer number (8665776).

Almost surely, 2^166090820 is an apocalyptic number.

166090820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166090820 is an abundant number, since it is smaller than the sum of its proper divisors (249866428).

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

166090820 is a wasteful number, since it uses less digits than its factorization.

166090820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51620 (or 51618 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 166090820 is about 12887.6227443233. The cubic root of 166090820 is about 549.6866755334.

The spelling of 166090820 in words is "one hundred sixty-six million, ninety thousand, eight hundred twenty".