15664351543 has 2 divisors, whose sum is σ = 15664351544. Its totient is φ = 15664351542.

The previous prime is 15664351517. The next prime is 15664351609. The reversal of 15664351543 is 34515346651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15664351543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15664351543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15664351513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832175771 + 7832175772.

It is an arithmetic number, because the mean of its divisors is an integer number (7832175772).

Almost surely, 2^15664351543 is an apocalyptic number.

15664351543 is a deficient number, since it is larger than the sum of its proper divisors (1).

15664351543 is an equidigital number, since it uses as much as digits as its factorization.

15664351543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 43.

The spelling of 15664351543 in words is "fifteen billion, six hundred sixty-four million, three hundred fifty-one thousand, five hundred forty-three".