166493709 has 6 divisors (see below), whose sum is σ = 240490926. Its totient is φ = 110995800.

The previous prime is 166493707. The next prime is 166493731. The reversal of 166493709 is 907394661.

It can be written as a sum of positive squares in only one way, i.e., 153512100 + 12981609 = 12390^2 + 3603^2 .

It is not a de Polignac number, because 166493709 - 2¹ = 166493707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166493707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9249642 + ... + 9249659.

It is an arithmetic number, because the mean of its divisors is an integer number (40081821).

Almost surely, 2^166493709 is an apocalyptic number.

It is an amenable number.

166493709 is a deficient number, since it is larger than the sum of its proper divisors (73997217).

166493709 is a wasteful number, since it uses less digits than its factorization.

166493709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18499307 (or 18499304 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 166493709 is about 12903.2441269628. The cubic root of 166493709 is about 550.1307777169.

The spelling of 166493709 in words is "one hundred sixty-six million, four hundred ninety-three thousand, seven hundred nine".