11765722217 has 2 divisors, whose sum is σ = 11765722218. Its totient is φ = 11765722216.

The previous prime is 11765722207. The next prime is 11765722277. The reversal of 11765722217 is 71222756711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6548693776 + 5217028441 = 80924^2 + 72229^2 .

It is a cyclic number.

It is not a de Polignac number, because 11765722217 - 2²⁴ = 11748945001 is a prime.

It is not a weakly prime, because it can be changed into another prime (11765722207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5882861108 + 5882861109.

It is an arithmetic number, because the mean of its divisors is an integer number (5882861109).

Almost surely, 2^11765722217 is an apocalyptic number.

It is an amenable number.

11765722217 is a deficient number, since it is larger than the sum of its proper divisors (1).

11765722217 is an equidigital number, since it uses as much as digits as its factorization.

11765722217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82320, while the sum is 41.

The spelling of 11765722217 in words is "eleven billion, seven hundred sixty-five million, seven hundred twenty-two thousand, two hundred seventeen".