11851187617 has 2 divisors, whose sum is σ = 11851187618. Its totient is φ = 11851187616.

The previous prime is 11851187573. The next prime is 11851187629. The reversal of 11851187617 is 71678115811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6229787041 + 5621400576 = 78929^2 + 74976^2 .

It is a cyclic number.

It is not a de Polignac number, because 11851187617 - 2⁷ = 11851187489 is a prime.

It is not a weakly prime, because it can be changed into another prime (11851187417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5925593808 + 5925593809.

It is an arithmetic number, because the mean of its divisors is an integer number (5925593809).

Almost surely, 2^11851187617 is an apocalyptic number.

It is an amenable number.

11851187617 is a deficient number, since it is larger than the sum of its proper divisors (1).

11851187617 is an equidigital number, since it uses as much as digits as its factorization.

11851187617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 46.

The spelling of 11851187617 in words is "eleven billion, eight hundred fifty-one million, one hundred eighty-seven thousand, six hundred seventeen".