15116774861 has 2 divisors, whose sum is σ = 15116774862. Its totient is φ = 15116774860.

The previous prime is 15116774839. The next prime is 15116774903. The reversal of 15116774861 is 16847761151.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15116702500 + 72361 = 122950^2 + 269^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15116774861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15116774161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7558387430 + 7558387431.

It is an arithmetic number, because the mean of its divisors is an integer number (7558387431).

Almost surely, 2^15116774861 is an apocalyptic number.

It is an amenable number.

15116774861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15116774861 is an equidigital number, since it uses as much as digits as its factorization.

15116774861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 47.

The spelling of 15116774861 in words is "fifteen billion, one hundred sixteen million, seven hundred seventy-four thousand, eight hundred sixty-one".