165954973 has 4 divisors (see below), whose sum is σ = 166007548. Its totient is φ = 165902400.

The previous prime is 165954961. The next prime is 165954989. The reversal of 165954973 is 379459561.

165954973 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 96098809 + 69856164 = 9803^2 + 8358^2 .

It is a cyclic number.

It is not a de Polignac number, because 165954973 - 2⁵ = 165954941 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 (165954773) 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, 21228 + ... + 27973.

It is an arithmetic number, because the mean of its divisors is an integer number (41501887).

Almost surely, 2^165954973 is an apocalyptic number.

It is an amenable number.

165954973 is a deficient number, since it is larger than the sum of its proper divisors (52575).

165954973 is an equidigital number, since it uses as much as digits as its factorization.

165954973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52574.

The product of its digits is 1020600, while the sum is 49.

The square root of 165954973 is about 12882.3512217297. The cubic root of 165954973 is about 549.5367702915.

The spelling of 165954973 in words is "one hundred sixty-five million, nine hundred fifty-four thousand, nine hundred seventy-three".