250881776161 has 3 divisors (see below), whose sum is σ = 250882277043. Its totient is φ = 250881275280.

The previous prime is 250881776149. The next prime is 250881776219. The reversal of 250881776161 is 161677188052.

The square root of 250881776161 is 500881.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 102964616161 + 147917160000 = 320881^2 + 384600^2 .

It is not a de Polignac number, because 250881776161 - 2⁹ = 250881775649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 250881776099 and 250881776108.

It is not an unprimeable number, because it can be changed into a prime (250881774161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 250441 + ... + 751321.

It is an arithmetic number, because the mean of its divisors is an integer number (83627425681).

Almost surely, 2^250881776161 is an apocalyptic number.

250881776161 is the 500881-st square number.

250881776161 is the 250441-st centered octagonal number.

It is an amenable number.

250881776161 is a deficient number, since it is larger than the sum of its proper divisors (500882).

250881776161 is an frugal number, since it uses more digits than its factorization.

250881776161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001762 (or 500881 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 52.

The spelling of 250881776161 in words is "two hundred fifty billion, eight hundred eighty-one million, seven hundred seventy-six thousand, one hundred sixty-one".