165668453 has 2 divisors, whose sum is σ = 165668454. Its totient is φ = 165668452.

The previous prime is 165668449. The next prime is 165668501. The reversal of 165668453 is 354866561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134954689 + 30713764 = 11617^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 165668453 - 2² = 165668449 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165668653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82834226 + 82834227.

It is an arithmetic number, because the mean of its divisors is an integer number (82834227).

Almost surely, 2^165668453 is an apocalyptic number.

It is an amenable number.

165668453 is a deficient number, since it is larger than the sum of its proper divisors (1).

165668453 is an equidigital number, since it uses as much as digits as its factorization.

165668453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518400, while the sum is 44.

The square root of 165668453 is about 12871.2257769025. The cubic root of 165668453 is about 549.2203310920.

The spelling of 165668453 in words is "one hundred sixty-five million, six hundred sixty-eight thousand, four hundred fifty-three".