15966339881 has 2 divisors, whose sum is σ = 15966339882. Its totient is φ = 15966339880.

The previous prime is 15966339869. The next prime is 15966339887. The reversal of 15966339881 is 18893366951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10290073600 + 5676266281 = 101440^2 + 75341^2 .

It is a cyclic number.

It is not a de Polignac number, because 15966339881 - 2¹⁴ = 15966323497 is a prime.

It is a super-2 number, since 2×15966339881² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15966339881.

It is not a weakly prime, because it can be changed into another prime (15966339887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7983169940 + 7983169941.

It is an arithmetic number, because the mean of its divisors is an integer number (7983169941).

Almost surely, 2^15966339881 is an apocalyptic number.

It is an amenable number.

15966339881 is a deficient number, since it is larger than the sum of its proper divisors (1).

15966339881 is an equidigital number, since it uses as much as digits as its factorization.

15966339881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8398080, while the sum is 59.

The spelling of 15966339881 in words is "fifteen billion, nine hundred sixty-six million, three hundred thirty-nine thousand, eight hundred eighty-one".