11636691971 has 2 divisors, whose sum is σ = 11636691972. Its totient is φ = 11636691970.

The previous prime is 11636691959. The next prime is 11636692003. The reversal of 11636691971 is 17919663611.

It is a weak prime.

It is an emirp because it is prime and its reverse (17919663611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11636691971 - 2¹⁴ = 11636675587 is a prime.

It is not a weakly prime, because it can be changed into another prime (11636601971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5818345985 + 5818345986.

It is an arithmetic number, because the mean of its divisors is an integer number (5818345986).

Almost surely, 2^11636691971 is an apocalyptic number.

11636691971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11636691971 is an equidigital number, since it uses as much as digits as its factorization.

11636691971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 50.

The spelling of 11636691971 in words is "eleven billion, six hundred thirty-six million, six hundred ninety-one thousand, nine hundred seventy-one".