15934434689647 has 2 divisors, whose sum is σ = 15934434689648. Its totient is φ = 15934434689646.

The previous prime is 15934434689633. The next prime is 15934434689717. The reversal of 15934434689647 is 74698643443951.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15934434689647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15934434689647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15934434689627) 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, 7967217344823 + 7967217344824.

It is an arithmetic number, because the mean of its divisors is an integer number (7967217344824).

Almost surely, 2^{15934434689647} is an apocalyptic number.

15934434689647 is a deficient number, since it is larger than the sum of its proper divisors (1).

15934434689647 is an equidigital number, since it uses as much as digits as its factorization.

15934434689647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1881169920, while the sum is 73.

The spelling of 15934434689647 in words is "fifteen trillion, nine hundred thirty-four billion, four hundred thirty-four million, six hundred eighty-nine thousand, six hundred forty-seven".