166801380 has 48 divisors (see below), whose sum is σ = 491628480. Its totient is φ = 42139008.

The previous prime is 166801379. The next prime is 166801387. The reversal of 166801380 is 83108661.

It is not an unprimeable number, because it can be changed into a prime (166801387) 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, 72019 + ... + 74298.

It is an arithmetic number, because the mean of its divisors is an integer number (10242260).

Almost surely, 2^166801380 is an apocalyptic number.

166801380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166801380 is an abundant number, since it is smaller than the sum of its proper divisors (324827100).

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

166801380 is a wasteful number, since it uses less digits than its factorization.

166801380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146348 (or 146346 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 166801380 is about 12915.1608584640. The cubic root of 166801380 is about 550.4694394275.

The spelling of 166801380 in words is "one hundred sixty-six million, eight hundred one thousand, three hundred eighty".