165720352758023 has 16 divisors (see below), whose sum is σ = 189432883729920. Its totient is φ = 142017373335456.

The previous prime is 165720352757903. The next prime is 165720352758073. The reversal of 165720352758023 is 320857253027561.

It is a cyclic number.

It is not a de Polignac number, because 165720352758023 - 2²² = 165720348563719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165720352758023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165720352758073) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 772975640 + ... + 773190002.

It is an arithmetic number, because the mean of its divisors is an integer number (11839555233120).

Almost surely, 2^{165720352758023} is an apocalyptic number.

165720352758023 is a deficient number, since it is larger than the sum of its proper divisors (23712530971897).

165720352758023 is a wasteful number, since it uses less digits than its factorization.

165720352758023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236126.

The product of its (nonzero) digits is 21168000, while the sum is 56.

The spelling of 165720352758023 in words is "one hundred sixty-five trillion, seven hundred twenty billion, three hundred fifty-two million, seven hundred fifty-eight thousand, twenty-three".