15805141861 has 2 divisors, whose sum is σ = 15805141862. Its totient is φ = 15805141860.

The previous prime is 15805141841. The next prime is 15805141867. The reversal of 15805141861 is 16814150851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15399320836 + 405821025 = 124094^2 + 20145^2 .

It is a cyclic number.

It is not a de Polignac number, because 15805141861 - 2⁷ = 15805141733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15805141867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7902570930 + 7902570931.

It is an arithmetic number, because the mean of its divisors is an integer number (7902570931).

Almost surely, 2^15805141861 is an apocalyptic number.

It is an amenable number.

15805141861 is a deficient number, since it is larger than the sum of its proper divisors (1).

15805141861 is an equidigital number, since it uses as much as digits as its factorization.

15805141861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38400, while the sum is 40.

The spelling of 15805141861 in words is "fifteen billion, eight hundred five million, one hundred forty-one thousand, eight hundred sixty-one".