165120735623 has 2 divisors, whose sum is σ = 165120735624. Its totient is φ = 165120735622.

The previous prime is 165120735583. The next prime is 165120735709. The reversal of 165120735623 is 326537021561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165120735623 - 2²⁸ = 164852300167 is a prime.

It is a super-2 number, since 2×165120735623² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165120731623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82560367811 + 82560367812.

It is an arithmetic number, because the mean of its divisors is an integer number (82560367812).

Almost surely, 2^165120735623 is an apocalyptic number.

165120735623 is a deficient number, since it is larger than the sum of its proper divisors (1).

165120735623 is an equidigital number, since it uses as much as digits as its factorization.

165120735623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

The spelling of 165120735623 in words is "one hundred sixty-five billion, one hundred twenty million, seven hundred thirty-five thousand, six hundred twenty-three".