166719990 has 16 divisors (see below), whose sum is σ = 400128048. Its totient is φ = 44458656.

The previous prime is 166719983. The next prime is 166719991. The reversal of 166719990 is 99917661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166719991) 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, 2778637 + ... + 2778696.

It is an arithmetic number, because the mean of its divisors is an integer number (25008003).

Almost surely, 2^166719990 is an apocalyptic number.

166719990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

166719990 is an abundant number, since it is smaller than the sum of its proper divisors (233408058).

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

166719990 is a wasteful number, since it uses less digits than its factorization.

166719990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5557343.

The product of its (nonzero) digits is 183708, while the sum is 48.

The square root of 166719990 is about 12912.0095260188. The cubic root of 166719990 is about 550.3798918136.

The spelling of 166719990 in words is "one hundred sixty-six million, seven hundred nineteen thousand, nine hundred ninety".