268187480250581 has 2 divisors, whose sum is σ = 268187480250582. Its totient is φ = 268187480250580.

The previous prime is 268187480250563. The next prime is 268187480250593. The reversal of 268187480250581 is 185052084781862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237652285200625 + 30535195049956 = 15415975^2 + 5525866^2 .

It is a cyclic number.

It is not a de Polignac number, because 268187480250581 - 2¹⁸ = 268187479988437 is a prime.

It is a super-2 number, since 2×268187480250581² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268187480250181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134093740125290 + 134093740125291.

It is an arithmetic number, because the mean of its divisors is an integer number (134093740125291).

Almost surely, 2^{268187480250581} is an apocalyptic number.

It is an amenable number.

268187480250581 is a deficient number, since it is larger than the sum of its proper divisors (1).

268187480250581 is an equidigital number, since it uses as much as digits as its factorization.

268187480250581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68812800, while the sum is 65.

The spelling of 268187480250581 in words is "two hundred sixty-eight trillion, one hundred eighty-seven billion, four hundred eighty million, two hundred fifty thousand, five hundred eighty-one".