166990918 has 8 divisors (see below), whose sum is σ = 251798400. Its totient is φ = 83058120.

The previous prime is 166990877. The next prime is 166990919. The reversal of 166990918 is 819099661.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166990919) 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, 218193 + ... + 218956.

It is an arithmetic number, because the mean of its divisors is an integer number (31474800).

Almost surely, 2^166990918 is an apocalyptic number.

166990918 is a deficient number, since it is larger than the sum of its proper divisors (84807482).

166990918 is a wasteful number, since it uses less digits than its factorization.

166990918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437342.

The product of its (nonzero) digits is 209952, while the sum is 49.

The square root of 166990918 is about 12922.4965854126. The cubic root of 166990918 is about 550.6778617292.

The spelling of 166990918 in words is "one hundred sixty-six million, nine hundred ninety thousand, nine hundred eighteen".