165720623 has 2 divisors, whose sum is σ = 165720624. Its totient is φ = 165720622.

The previous prime is 165720601. The next prime is 165720677. The reversal of 165720623 is 326027561.

165720623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165720623 - 2⁸ = 165720367 is a prime.

It is a super-3 number, since 3×165720623³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165720623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165720683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82860311 + 82860312.

It is an arithmetic number, because the mean of its divisors is an integer number (82860312).

Almost surely, 2^165720623 is an apocalyptic number.

165720623 is a deficient number, since it is larger than the sum of its proper divisors (1).

165720623 is an equidigital number, since it uses as much as digits as its factorization.

165720623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 165720623 is about 12873.2522308856. The cubic root of 165720623 is about 549.2779759786.

The spelling of 165720623 in words is "one hundred sixty-five million, seven hundred twenty thousand, six hundred twenty-three".