161800256 has 14 divisors (see below), whose sum is σ = 321072510. Its totient is φ = 80900096.

The previous prime is 161800211. The next prime is 161800259. The reversal of 161800256 is 652008161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 115777600 + 46022656 = 10760^2 + 6784^2 .

It is not an unprimeable number, because it can be changed into a prime (161800259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1264001 + ... + 1264128.

Almost surely, 2^161800256 is an apocalyptic number.

161800256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161800256 is a deficient number, since it is larger than the sum of its proper divisors (159272254).

161800256 is an equidigital number, since it uses as much as digits as its factorization.

161800256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528141 (or 2528131 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 161800256 is about 12720.0729557656. The cubic root of 161800256 is about 544.9120369777.

The spelling of 161800256 in words is "one hundred sixty-one million, eight hundred thousand, two hundred fifty-six".