1261563598027 has 2 divisors, whose sum is σ = 1261563598028. Its totient is φ = 1261563598026.

The previous prime is 1261563597997. The next prime is 1261563598039. The reversal of 1261563598027 is 7208953651621.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261563598027 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261563598627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630781799013 + 630781799014.

It is an arithmetic number, because the mean of its divisors is an integer number (630781799014).

Almost surely, 2^{1261563598027} is an apocalyptic number.

1261563598027 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261563598027 is an equidigital number, since it uses as much as digits as its factorization.

1261563598027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 55.

The spelling of 1261563598027 in words is "one trillion, two hundred sixty-one billion, five hundred sixty-three million, five hundred ninety-eight thousand, twenty-seven".