20165388169 has 4 divisors (see below), whose sum is σ = 20187331840. Its totient is φ = 20143444500.

The previous prime is 20165388157. The next prime is 20165388227. The reversal of 20165388169 is 96188356102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20165388169 - 2⁵ = 20165388137 is a prime.

It is a super-2 number, since 2×20165388169² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20165338169) 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 3 ways as a sum of consecutive naturals, for example, 10970457 + ... + 10972294.

It is an arithmetic number, because the mean of its divisors is an integer number (5046832960).

Almost surely, 2^20165388169 is an apocalyptic number.

It is an amenable number.

20165388169 is a deficient number, since it is larger than the sum of its proper divisors (21943671).

20165388169 is an equidigital number, since it uses as much as digits as its factorization.

20165388169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21943670.

The product of its (nonzero) digits is 622080, while the sum is 49.

The spelling of 20165388169 in words is "twenty billion, one hundred sixty-five million, three hundred eighty-eight thousand, one hundred sixty-nine".