166640355 has 64 divisors (see below), whose sum is σ = 356428800. Its totient is φ = 72161280.

The previous prime is 166640311. The next prime is 166640363. The reversal of 166640355 is 553046661.

It is not a de Polignac number, because 166640355 - 2⁸ = 166640099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 13315 + ... + 22595.

It is an arithmetic number, because the mean of its divisors is an integer number (5569200).

Almost surely, 2^166640355 is an apocalyptic number.

166640355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166640355 is an abundant number, since it is smaller than the sum of its proper divisors (189788445).

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

166640355 is a wasteful number, since it uses less digits than its factorization.

166640355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9321 (or 9315 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 166640355 is about 12908.9254006676. The cubic root of 166640355 is about 550.2922468886.

The spelling of 166640355 in words is "one hundred sixty-six million, six hundred forty thousand, three hundred fifty-five".