11643765391 has 2 divisors, whose sum is σ = 11643765392. Its totient is φ = 11643765390.

The previous prime is 11643765349. The next prime is 11643765457. The reversal of 11643765391 is 19356734611.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11643765391 - 2²⁷ = 11509547663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11643765491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5821882695 + 5821882696.

It is an arithmetic number, because the mean of its divisors is an integer number (5821882696).

Almost surely, 2^11643765391 is an apocalyptic number.

11643765391 is a deficient number, since it is larger than the sum of its proper divisors (1).

11643765391 is an equidigital number, since it uses as much as digits as its factorization.

11643765391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 46.

The spelling of 11643765391 in words is "eleven billion, six hundred forty-three million, seven hundred sixty-five thousand, three hundred ninety-one".