261268337251 has 2 divisors, whose sum is σ = 261268337252. Its totient is φ = 261268337250.

The previous prime is 261268337243. The next prime is 261268337339. The reversal of 261268337251 is 152733862162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261268337251 - 2³ = 261268337243 is a prime.

It is a super-2 number, since 2×261268337251² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261268337221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130634168625 + 130634168626.

It is an arithmetic number, because the mean of its divisors is an integer number (130634168626).

Almost surely, 2^261268337251 is an apocalyptic number.

261268337251 is a deficient number, since it is larger than the sum of its proper divisors (1).

261268337251 is an equidigital number, since it uses as much as digits as its factorization.

261268337251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The spelling of 261268337251 in words is "two hundred sixty-one billion, two hundred sixty-eight million, three hundred thirty-seven thousand, two hundred fifty-one".