165445261856 has 24 divisors (see below), whose sum is σ = 372251839680. Its totient is φ = 70905112128.

The previous prime is 165445261853. The next prime is 165445261867. The reversal of 165445261856 is 658162544561.

It is a junction number, because it is equal to n+sod(n) for n = 165445261798 and 165445261807.

It is not an unprimeable number, because it can be changed into a prime (165445261853) 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, 369297236 + ... + 369297683.

It is an arithmetic number, because the mean of its divisors is an integer number (15510493320).

Almost surely, 2^165445261856 is an apocalyptic number.

165445261856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165445261856 is an abundant number, since it is smaller than the sum of its proper divisors (206806577824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165445261856 is an equidigital number, since it uses as much as digits as its factorization.

165445261856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 738594936 (or 738594928 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 53.

The spelling of 165445261856 in words is "one hundred sixty-five billion, four hundred forty-five million, two hundred sixty-one thousand, eight hundred fifty-six".