261646127444731 has 2 divisors, whose sum is σ = 261646127444732. Its totient is φ = 261646127444730.

The previous prime is 261646127444707. The next prime is 261646127444753. The reversal of 261646127444731 is 137444721646162.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261646127444731 is a prime.

It is a super-2 number, since 2×261646127444731² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261646127444761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130823063722365 + 130823063722366.

It is an arithmetic number, because the mean of its divisors is an integer number (130823063722366).

Almost surely, 2^{261646127444731} is an apocalyptic number.

261646127444731 is a deficient number, since it is larger than the sum of its proper divisors (1).

261646127444731 is an equidigital number, since it uses as much as digits as its factorization.

261646127444731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32514048, while the sum is 58.

The spelling of 261646127444731 in words is "two hundred sixty-one trillion, six hundred forty-six billion, one hundred twenty-seven million, four hundred forty-four thousand, seven hundred thirty-one".