166140989 has 8 divisors (see below), whose sum is σ = 195007488. Its totient is φ = 138557520.

The previous prime is 166140973. The next prime is 166141007. The reversal of 166140989 is 989041661.

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

It is a cyclic number.

It is not a de Polignac number, because 166140989 - 2⁴ = 166140973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166140589) 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, 320477 + ... + 320994.

It is an arithmetic number, because the mean of its divisors is an integer number (24375936).

Almost surely, 2^166140989 is an apocalyptic number.

It is an amenable number.

166140989 is a deficient number, since it is larger than the sum of its proper divisors (28866499).

166140989 is an equidigital number, since it uses as much as digits as its factorization.

166140989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641515.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 166140989 is about 12889.5689997765. The cubic root of 166140989 is about 549.7420156473.

The spelling of 166140989 in words is "one hundred sixty-six million, one hundred forty thousand, nine hundred eighty-nine".