12661531411 has 2 divisors, whose sum is σ = 12661531412. Its totient is φ = 12661531410.

The previous prime is 12661531373. The next prime is 12661531423. The reversal of 12661531411 is 11413516621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12661531411 - 2²¹ = 12659434259 is a prime.

It is not a weakly prime, because it can be changed into another prime (12661531471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330765705 + 6330765706.

It is an arithmetic number, because the mean of its divisors is an integer number (6330765706).

Almost surely, 2^12661531411 is an apocalyptic number.

12661531411 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661531411 is an equidigital number, since it uses as much as digits as its factorization.

12661531411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 31.

The spelling of 12661531411 in words is "twelve billion, six hundred sixty-one million, five hundred thirty-one thousand, four hundred eleven".