15217696847987 has 2 divisors, whose sum is σ = 15217696847988. Its totient is φ = 15217696847986.

The previous prime is 15217696847981. The next prime is 15217696848149. The reversal of 15217696847987 is 78974869671251.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15217696847987 is a prime.

It is not a weakly prime, because it can be changed into another prime (15217696847981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7608848423993 + 7608848423994.

It is an arithmetic number, because the mean of its divisors is an integer number (7608848423994).

Almost surely, 2^{15217696847987} is an apocalyptic number.

15217696847987 is a deficient number, since it is larger than the sum of its proper divisors (1).

15217696847987 is an equidigital number, since it uses as much as digits as its factorization.

15217696847987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2560481280, while the sum is 80.

The spelling of 15217696847987 in words is "fifteen trillion, two hundred seventeen billion, six hundred ninety-six million, eight hundred forty-seven thousand, nine hundred eighty-seven".