126558815013991 has 2 divisors, whose sum is σ = 126558815013992. Its totient is φ = 126558815013990.

The previous prime is 126558815013949. The next prime is 126558815014003. The reversal of 126558815013991 is 199310518855621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126558815013991 - 2¹¹ = 126558815011943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126558815013931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63279407506995 + 63279407506996.

It is an arithmetic number, because the mean of its divisors is an integer number (63279407506996).

Almost surely, 2^{126558815013991} is an apocalyptic number.

126558815013991 is a deficient number, since it is larger than the sum of its proper divisors (1).

126558815013991 is an equidigital number, since it uses as much as digits as its factorization.

126558815013991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328000, while the sum is 64.

The spelling of 126558815013991 in words is "one hundred twenty-six trillion, five hundred fifty-eight billion, eight hundred fifteen million, thirteen thousand, nine hundred ninety-one".