11594778661 has 2 divisors, whose sum is σ = 11594778662. Its totient is φ = 11594778660.

The previous prime is 11594778647. The next prime is 11594778667. The reversal of 11594778661 is 16687749511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11234728036 + 360050625 = 105994^2 + 18975^2 .

It is a cyclic number.

It is not a de Polignac number, because 11594778661 - 2²¹ = 11592681509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11594778667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5797389330 + 5797389331.

It is an arithmetic number, because the mean of its divisors is an integer number (5797389331).

Almost surely, 2^11594778661 is an apocalyptic number.

It is an amenable number.

11594778661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11594778661 is an equidigital number, since it uses as much as digits as its factorization.

11594778661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 55.

The spelling of 11594778661 in words is "eleven billion, five hundred ninety-four million, seven hundred seventy-eight thousand, six hundred sixty-one".