166749137 has 4 divisors (see below), whose sum is σ = 166959156. Its totient is φ = 166539120.

The previous prime is 166749113. The next prime is 166749151. The reversal of 166749137 is 731947661.

166749137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56415121 + 110334016 = 7511^2 + 10504^2 .

It is a cyclic number.

It is not a de Polignac number, because 166749137 - 2¹⁸ = 166486993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166749197) 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, 103814 + ... + 105407.

It is an arithmetic number, because the mean of its divisors is an integer number (41739789).

Almost surely, 2^166749137 is an apocalyptic number.

It is an amenable number.

166749137 is a deficient number, since it is larger than the sum of its proper divisors (210019).

166749137 is an equidigital number, since it uses as much as digits as its factorization.

166749137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210018.

The product of its digits is 190512, while the sum is 44.

The square root of 166749137 is about 12913.1381546083. The cubic root of 166749137 is about 550.4119635285.

The spelling of 166749137 in words is "one hundred sixty-six million, seven hundred forty-nine thousand, one hundred thirty-seven".