261421660076231 has 2 divisors, whose sum is σ = 261421660076232. Its totient is φ = 261421660076230.

The previous prime is 261421660076221. The next prime is 261421660076261. The reversal of 261421660076231 is 132670066124162.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261421660076231 is a prime.

It is a super-2 number, since 2×261421660076231² (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 (261421660076221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130710830038115 + 130710830038116.

It is an arithmetic number, because the mean of its divisors is an integer number (130710830038116).

Almost surely, 2^{261421660076231} is an apocalyptic number.

261421660076231 is a deficient number, since it is larger than the sum of its proper divisors (1).

261421660076231 is an equidigital number, since it uses as much as digits as its factorization.

261421660076231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 47.

The spelling of 261421660076231 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, six hundred sixty million, seventy-six thousand, two hundred thirty-one".