261543674101427 has 2 divisors, whose sum is σ = 261543674101428. Its totient is φ = 261543674101426.

The previous prime is 261543674101417. The next prime is 261543674101459. The reversal of 261543674101427 is 724101476345162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261543674101427 is a prime.

It is not a weakly prime, because it can be changed into another prime (261543674101417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130771837050713 + 130771837050714.

It is an arithmetic number, because the mean of its divisors is an integer number (130771837050714).

Almost surely, 2^{261543674101427} is an apocalyptic number.

261543674101427 is a deficient number, since it is larger than the sum of its proper divisors (1).

261543674101427 is an equidigital number, since it uses as much as digits as its factorization.

261543674101427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 261543674101427 in words is "two hundred sixty-one trillion, five hundred forty-three billion, six hundred seventy-four million, one hundred one thousand, four hundred twenty-seven".