15664487 has 2 divisors, whose sum is σ = 15664488. Its totient is φ = 15664486.

The previous prime is 15664477. The next prime is 15664529. The reversal of 15664487 is 78446651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15664487 - 2⁴ = 15664471 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 (15664457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7832243 + 7832244.

It is an arithmetic number, because the mean of its divisors is an integer number (7832244).

Almost surely, 2^15664487 is an apocalyptic number.

15664487 is a deficient number, since it is larger than the sum of its proper divisors (1).

15664487 is an equidigital number, since it uses as much as digits as its factorization.

15664487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 161280, while the sum is 41.

The square root of 15664487 is about 3957.8386778645. The cubic root of 15664487 is about 250.2104201770.

The spelling of 15664487 in words is "fifteen million, six hundred sixty-four thousand, four hundred eighty-seven".