15891367997 has 2 divisors, whose sum is σ = 15891367998. Its totient is φ = 15891367996.

The previous prime is 15891367949. The next prime is 15891368041. The reversal of 15891367997 is 79976319851.

15891367997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15729925561 + 161442436 = 125419^2 + 12706^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15891367997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15891367927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7945683998 + 7945683999.

It is an arithmetic number, because the mean of its divisors is an integer number (7945683999).

Almost surely, 2^15891367997 is an apocalyptic number.

It is an amenable number.

15891367997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15891367997 is an equidigital number, since it uses as much as digits as its factorization.

15891367997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25719120, while the sum is 65.

The spelling of 15891367997 in words is "fifteen billion, eight hundred ninety-one million, three hundred sixty-seven thousand, nine hundred ninety-seven".