161255568889 has 8 divisors (see below), whose sum is σ = 161990841600. Its totient is φ = 160520405136.

The previous prime is 161255568869. The next prime is 161255568923. The reversal of 161255568889 is 988865552161.

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 161255568889 - 2²¹ = 161253471737 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 161255568889.

It is not an unprimeable number, because it can be changed into a prime (161255568809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5236074 + ... + 5266780.

It is an arithmetic number, because the mean of its divisors is an integer number (20248855200).

Almost surely, 2^161255568889 is an apocalyptic number.

It is an amenable number.

161255568889 is a deficient number, since it is larger than the sum of its proper divisors (735272711).

161255568889 is a wasteful number, since it uses less digits than its factorization.

161255568889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54479.

The product of its digits is 41472000, while the sum is 64.

The spelling of 161255568889 in words is "one hundred sixty-one billion, two hundred fifty-five million, five hundred sixty-eight thousand, eight hundred eighty-nine".