165225515623 has 8 divisors (see below), whose sum is σ = 189563906592. Its totient is φ = 141070811136.

The previous prime is 165225515591. The next prime is 165225515639. The reversal of 165225515623 is 326515522561.

165225515623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165225515623 - 2⁵ = 165225515591 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 165225515623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165225513623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45919690 + ... + 45923287.

It is an arithmetic number, because the mean of its divisors is an integer number (23695488324).

Almost surely, 2^165225515623 is an apocalyptic number.

165225515623 is a deficient number, since it is larger than the sum of its proper divisors (24338390969).

165225515623 is an equidigital number, since it uses as much as digits as its factorization.

165225515623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91843241.

The product of its digits is 540000, while the sum is 43.

The spelling of 165225515623 in words is "one hundred sixty-five billion, two hundred twenty-five million, five hundred fifteen thousand, six hundred twenty-three".