166749697 has 4 divisors (see below), whose sum is σ = 167070276. Its totient is φ = 166429120.

The previous prime is 166749691. The next prime is 166749721. The reversal of 166749697 is 796947661.

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 76195441 + 90554256 = 8729^2 + 9516^2 .

It is a cyclic number.

It is not a de Polignac number, because 166749697 - 2²³ = 158361089 is a prime.

It is a super-2 number, since 2×166749697² = 55610922899183618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166749691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159508 + ... + 160549.

It is an arithmetic number, because the mean of its divisors is an integer number (41767569).

Almost surely, 2^166749697 is an apocalyptic number.

It is an amenable number.

166749697 is a deficient number, since it is larger than the sum of its proper divisors (320579).

166749697 is an equidigital number, since it uses as much as digits as its factorization.

166749697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320578.

The product of its digits is 3429216, while the sum is 55.

The square root of 166749697 is about 12913.1598379328. The cubic root of 166749697 is about 550.4125796843.

The spelling of 166749697 in words is "one hundred sixty-six million, seven hundred forty-nine thousand, six hundred ninety-seven".