250561306671281 has 4 divisors (see below), whose sum is σ = 250561338808692. Its totient is φ = 250561274533872.

The previous prime is 250561306671229. The next prime is 250561306671287. The reversal of 250561306671281 is 182176603165052.

It is a happy 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 2 ways, for example, as 220509432193600 + 30051874477681 = 14849560^2 + 5481959^2 .

It is a cyclic number.

It is not a de Polignac number, because 250561306671281 - 2¹⁸ = 250561306409137 is a prime.

It is a super-2 number, since 2×250561306671281² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (250561306671287) 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, 3887735 + ... + 22720851.

It is an arithmetic number, because the mean of its divisors is an integer number (62640334702173).

Almost surely, 2^{250561306671281} is an apocalyptic number.

It is an amenable number.

250561306671281 is a deficient number, since it is larger than the sum of its proper divisors (32137411).

250561306671281 is a wasteful number, since it uses less digits than its factorization.

250561306671281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32137410.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 250561306671281 in words is "two hundred fifty trillion, five hundred sixty-one billion, three hundred six million, six hundred seventy-one thousand, two hundred eighty-one".