15378246997 has 2 divisors, whose sum is σ = 15378246998. Its totient is φ = 15378246996.

The previous prime is 15378246979. The next prime is 15378247033. The reversal of 15378246997 is 79964287351.

Together with previous prime (15378246979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12114524356 + 3263722641 = 110066^2 + 57129^2 .

It is a cyclic number.

It is not a de Polignac number, because 15378246997 - 2¹⁹ = 15377722709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15378256997) 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, 7689123498 + 7689123499.

It is an arithmetic number, because the mean of its divisors is an integer number (7689123499).

Almost surely, 2^15378246997 is an apocalyptic number.

It is an amenable number.

15378246997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15378246997 is an equidigital number, since it uses as much as digits as its factorization.

15378246997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 61.

The spelling of 15378246997 in words is "fifteen billion, three hundred seventy-eight million, two hundred forty-six thousand, nine hundred ninety-seven".