166549818 has 8 divisors (see below), whose sum is σ = 333099648. Its totient is φ = 55516604.

The previous prime is 166549787. The next prime is 166549819. The reversal of 166549818 is 818945661.

It is a sphenic number, since it is the product of 3 distinct primes.

166549818 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (166549819) 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, 13879146 + ... + 13879157.

It is an arithmetic number, because the mean of its divisors is an integer number (41637456).

Almost surely, 2^166549818 is an apocalyptic number.

166549818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

166549818 is a wasteful number, since it uses less digits than its factorization.

166549818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27758308.

The product of its digits is 414720, while the sum is 48.

The square root of 166549818 is about 12905.4181644765. The cubic root of 166549818 is about 550.1925694831.

The spelling of 166549818 in words is "one hundred sixty-six million, five hundred forty-nine thousand, eight hundred eighteen".