165116521659 has 4 divisors (see below), whose sum is σ = 220155362216. Its totient is φ = 110077681104.

The previous prime is 165116521631. The next prime is 165116521697. The reversal of 165116521659 is 956125611561.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165116521659 - 2⁵ = 165116521627 is a prime.

It is a super-2 number, since 2×165116521659² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165116528659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27519420274 + ... + 27519420279.

It is an arithmetic number, because the mean of its divisors is an integer number (55038840554).

Almost surely, 2^165116521659 is an apocalyptic number.

165116521659 is a deficient number, since it is larger than the sum of its proper divisors (55038840557).

165116521659 is an equidigital number, since it uses as much as digits as its factorization.

165116521659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55038840556.

The product of its digits is 486000, while the sum is 48.

The spelling of 165116521659 in words is "one hundred sixty-five billion, one hundred sixteen million, five hundred twenty-one thousand, six hundred fifty-nine".