261432660007427 has 2 divisors, whose sum is σ = 261432660007428. Its totient is φ = 261432660007426.

The previous prime is 261432660007423. The next prime is 261432660007469. The reversal of 261432660007427 is 724700066234162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261432660007427 - 2² = 261432660007423 is a prime.

It is not a weakly prime, because it can be changed into another prime (261432660007423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130716330003713 + 130716330003714.

It is an arithmetic number, because the mean of its divisors is an integer number (130716330003714).

Almost surely, 2^{261432660007427} is an apocalyptic number.

261432660007427 is a deficient number, since it is larger than the sum of its proper divisors (1).

261432660007427 is an equidigital number, since it uses as much as digits as its factorization.

261432660007427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4064256, while the sum is 50.

The spelling of 261432660007427 in words is "two hundred sixty-one trillion, four hundred thirty-two billion, six hundred sixty million, seven thousand, four hundred twenty-seven".