11801564617 has 2 divisors, whose sum is σ = 11801564618. Its totient is φ = 11801564616.

The previous prime is 11801564603. The next prime is 11801564627. The reversal of 11801564617 is 71646510811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10524502921 + 1277061696 = 102589^2 + 35736^2 .

It is a cyclic number.

It is not a de Polignac number, because 11801564617 - 2¹¹ = 11801562569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11801564617.

It is not a weakly prime, because it can be changed into another prime (11801564627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5900782308 + 5900782309.

It is an arithmetic number, because the mean of its divisors is an integer number (5900782309).

Almost surely, 2^11801564617 is an apocalyptic number.

It is an amenable number.

11801564617 is a deficient number, since it is larger than the sum of its proper divisors (1).

11801564617 is an equidigital number, since it uses as much as digits as its factorization.

11801564617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 11801564617 in words is "eleven billion, eight hundred one million, five hundred sixty-four thousand, six hundred seventeen".