161255864206336 has 33 divisors (see below), whose sum is σ = 322355064301981. Its totient is φ = 80627728924672.

The previous prime is 161255864206279. The next prime is 161255864206397. The reversal of 161255864206336 is 633602468552161.

It is a happy number.

The square root of 161255864206336 is 12698656.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16634651673600 + 144621212532736 = 4078560^2 + 12025856^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 406158576 + ... + 406555408.

Almost surely, 2^{161255864206336} is an apocalyptic number.

161255864206336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

161255864206336 is the 12698656-th square number.

It is an amenable number.

161255864206336 is a deficient number, since it is larger than the sum of its proper divisors (161099200095645).

161255864206336 is an frugal number, since it uses more digits than its factorization.

161255864206336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793686 (or 396835 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 58.

The spelling of 161255864206336 in words is "one hundred sixty-one trillion, two hundred fifty-five billion, eight hundred sixty-four million, two hundred six thousand, three hundred thirty-six".