15963491779 has 2 divisors, whose sum is σ = 15963491780. Its totient is φ = 15963491778.

The previous prime is 15963491743. The next prime is 15963491783. The reversal of 15963491779 is 97719436951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15963491779 - 2¹⁵ = 15963459011 is a prime.

It is not a weakly prime, because it can be changed into another prime (15963431779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7981745889 + 7981745890.

It is an arithmetic number, because the mean of its divisors is an integer number (7981745890).

Almost surely, 2^15963491779 is an apocalyptic number.

15963491779 is a deficient number, since it is larger than the sum of its proper divisors (1).

15963491779 is an equidigital number, since it uses as much as digits as its factorization.

15963491779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12859560, while the sum is 61.

The spelling of 15963491779 in words is "fifteen billion, nine hundred sixty-three million, four hundred ninety-one thousand, seven hundred seventy-nine".