166819998 has 16 divisors (see below), whose sum is σ = 337389840. Its totient is φ = 54981696.

The previous prime is 166819949. The next prime is 166819999. The reversal of 166819998 is 899918661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166819999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155665 + ... + 156732.

It is an arithmetic number, because the mean of its divisors is an integer number (21086865).

Almost surely, 2^166819998 is an apocalyptic number.

166819998 is an abundant number, since it is smaller than the sum of its proper divisors (170569842).

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

166819998 is a wasteful number, since it uses less digits than its factorization.

166819998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312491.

The product of its digits is 1679616, while the sum is 57.

The square root of 166819998 is about 12915.8816191540. The cubic root of 166819998 is about 550.4899193915.

The spelling of 166819998 in words is "one hundred sixty-six million, eight hundred nineteen thousand, nine hundred ninety-eight".