15966640841 has 2 divisors, whose sum is σ = 15966640842. Its totient is φ = 15966640840.

The previous prime is 15966640819. The next prime is 15966640889. The reversal of 15966640841 is 14804666951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12943840441 + 3022800400 = 113771^2 + 54980^2 .

It is an emirp because it is prime and its reverse (14804666951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15966640841 - 2²² = 15962446537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15966640841.

It is not a weakly prime, because it can be changed into another prime (15966640801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7983320420 + 7983320421.

It is an arithmetic number, because the mean of its divisors is an integer number (7983320421).

Almost surely, 2^15966640841 is an apocalyptic number.

It is an amenable number.

15966640841 is a deficient number, since it is larger than the sum of its proper divisors (1).

15966640841 is an equidigital number, since it uses as much as digits as its factorization.

15966640841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 15966640841 in words is "fifteen billion, nine hundred sixty-six million, six hundred forty thousand, eight hundred forty-one".