165765435427 has 2 divisors, whose sum is σ = 165765435428. Its totient is φ = 165765435426.

The previous prime is 165765435361. The next prime is 165765435431. The reversal of 165765435427 is 724534567561.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165765435427 is a prime.

It is not a weakly prime, because it can be changed into another prime (165765435127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82882717713 + 82882717714.

It is an arithmetic number, because the mean of its divisors is an integer number (82882717714).

Almost surely, 2^165765435427 is an apocalyptic number.

165765435427 is a deficient number, since it is larger than the sum of its proper divisors (1).

165765435427 is an equidigital number, since it uses as much as digits as its factorization.

165765435427 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168000, while the sum is 55.

The spelling of 165765435427 in words is "one hundred sixty-five billion, seven hundred sixty-five million, four hundred thirty-five thousand, four hundred twenty-seven".