15663671 has 2 divisors, whose sum is σ = 15663672. Its totient is φ = 15663670.

The previous prime is 15663629. The next prime is 15663689. The reversal of 15663671 is 17636651.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15663671 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15663611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7831835 + 7831836.

It is an arithmetic number, because the mean of its divisors is an integer number (7831836).

Almost surely, 2^15663671 is an apocalyptic number.

15663671 is a deficient number, since it is larger than the sum of its proper divisors (1).

15663671 is an equidigital number, since it uses as much as digits as its factorization.

15663671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 35.

The square root of 15663671 is about 3957.7355899554. The cubic root of 15663671 is about 250.2060754183.

The spelling of 15663671 in words is "fifteen million, six hundred sixty-three thousand, six hundred seventy-one".