11975561371 has 2 divisors, whose sum is σ = 11975561372. Its totient is φ = 11975561370.

The previous prime is 11975561327. The next prime is 11975561399. The reversal of 11975561371 is 17316557911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11975561371 - 2²¹ = 11973464219 is a prime.

It is not a weakly prime, because it can be changed into another prime (11975561321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5987780685 + 5987780686.

It is an arithmetic number, because the mean of its divisors is an integer number (5987780686).

Almost surely, 2^11975561371 is an apocalyptic number.

11975561371 is a deficient number, since it is larger than the sum of its proper divisors (1).

11975561371 is an equidigital number, since it uses as much as digits as its factorization.

11975561371 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 46.

The spelling of 11975561371 in words is "eleven billion, nine hundred seventy-five million, five hundred sixty-one thousand, three hundred seventy-one".