11801177809 has 2 divisors, whose sum is σ = 11801177810. Its totient is φ = 11801177808.

The previous prime is 11801177803. The next prime is 11801177851. The reversal of 11801177809 is 90877110811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9859894209 + 1941283600 = 99297^2 + 44060^2 .

It is a cyclic number.

It is not a de Polignac number, because 11801177809 - 2⁵ = 11801177777 is a prime.

It is not a weakly prime, because it can be changed into another prime (11801177803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5900588904 + 5900588905.

It is an arithmetic number, because the mean of its divisors is an integer number (5900588905).

Almost surely, 2^11801177809 is an apocalyptic number.

It is an amenable number.

11801177809 is a deficient number, since it is larger than the sum of its proper divisors (1).

11801177809 is an equidigital number, since it uses as much as digits as its factorization.

11801177809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 43.

The spelling of 11801177809 in words is "eleven billion, eight hundred one million, one hundred seventy-seven thousand, eight hundred nine".