165972259 has 2 divisors, whose sum is σ = 165972260. Its totient is φ = 165972258.

The previous prime is 165972211. The next prime is 165972281. The reversal of 165972259 is 952279561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165972259 is a prime.

It is not a weakly prime, because it can be changed into another prime (165972299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82986129 + 82986130.

It is an arithmetic number, because the mean of its divisors is an integer number (82986130).

Almost surely, 2^165972259 is an apocalyptic number.

165972259 is a deficient number, since it is larger than the sum of its proper divisors (1).

165972259 is an equidigital number, since it uses as much as digits as its factorization.

165972259 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 46.

The square root of 165972259 is about 12883.0221221575. The cubic root of 165972259 is about 549.5558496892. Note that the first 3 decimals are identical.

The spelling of 165972259 in words is "one hundred sixty-five million, nine hundred seventy-two thousand, two hundred fifty-nine".