165456791 has 2 divisors, whose sum is σ = 165456792. Its totient is φ = 165456790.

The previous prime is 165456787. The next prime is 165456793. The reversal of 165456791 is 197654561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165456791 - 2² = 165456787 is a prime.

Together with 165456793, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165456793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82728395 + 82728396.

It is an arithmetic number, because the mean of its divisors is an integer number (82728396).

Almost surely, 2^165456791 is an apocalyptic number.

165456791 is a deficient number, since it is larger than the sum of its proper divisors (1).

165456791 is an equidigital number, since it uses as much as digits as its factorization.

165456791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 165456791 is about 12863.0008551660. Note that the first 3 decimals coincide. The cubic root of 165456791 is about 548.9863323748.

The spelling of 165456791 in words is "one hundred sixty-five million, four hundred fifty-six thousand, seven hundred ninety-one".