12191975551027 has 2 divisors, whose sum is σ = 12191975551028. Its totient is φ = 12191975551026.

The previous prime is 12191975550971. The next prime is 12191975551031. The reversal of 12191975551027 is 72015557919121.

12191975551027 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12191975551027 - 2³⁹ = 11642219737139 is a prime.

It is not a weakly prime, because it can be changed into another prime (12191975551057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6095987775513 + 6095987775514.

It is an arithmetic number, because the mean of its divisors is an integer number (6095987775514).

Almost surely, 2^{12191975551027} is an apocalyptic number.

12191975551027 is a deficient number, since it is larger than the sum of its proper divisors (1).

12191975551027 is an equidigital number, since it uses as much as digits as its factorization.

12191975551027 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1984500, while the sum is 55.

The spelling of 12191975551027 in words is "twelve trillion, one hundred ninety-one billion, nine hundred seventy-five million, five hundred fifty-one thousand, twenty-seven".