15664963 has 2 divisors, whose sum is σ = 15664964. Its totient is φ = 15664962.

The previous prime is 15664937. The next prime is 15664967. The reversal of 15664963 is 36946651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15664963 - 2¹⁷ = 15533891 is a prime.

It is not a weakly prime, because it can be changed into another prime (15664967) 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, 7832481 + 7832482.

It is an arithmetic number, because the mean of its divisors is an integer number (7832482).

Almost surely, 2^15664963 is an apocalyptic number.

15664963 is a deficient number, since it is larger than the sum of its proper divisors (1).

15664963 is an equidigital number, since it uses as much as digits as its factorization.

15664963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 40.

The square root of 15664963 is about 3957.8988112381. The cubic root of 15664963 is about 250.2129545499.

The spelling of 15664963 in words is "fifteen million, six hundred sixty-four thousand, nine hundred sixty-three".