15942847993 has 2 divisors, whose sum is σ = 15942847994. Its totient is φ = 15942847992.

The previous prime is 15942847981. The next prime is 15942848021. The reversal of 15942847993 is 39974824951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14599405584 + 1343442409 = 120828^2 + 36653^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15942847993 is a prime.

It is not a weakly prime, because it can be changed into another prime (15942847913) 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, 7971423996 + 7971423997.

It is an arithmetic number, because the mean of its divisors is an integer number (7971423997).

Almost surely, 2^15942847993 is an apocalyptic number.

It is an amenable number.

15942847993 is a deficient number, since it is larger than the sum of its proper divisors (1).

15942847993 is an equidigital number, since it uses as much as digits as its factorization.

15942847993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19595520, while the sum is 61.

The spelling of 15942847993 in words is "fifteen billion, nine hundred forty-two million, eight hundred forty-seven thousand, nine hundred ninety-three".