15664855 has 4 divisors (see below), whose sum is σ = 18797832. Its totient is φ = 12531880.

The previous prime is 15664841. The next prime is 15664867. The reversal of 15664855 is 55846651.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 15664855 - 2¹⁵ = 15632087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1566481 + ... + 1566490.

It is an arithmetic number, because the mean of its divisors is an integer number (4699458).

Almost surely, 2^15664855 is an apocalyptic number.

15664855 is a deficient number, since it is larger than the sum of its proper divisors (3132977).

15664855 is an equidigital number, since it uses as much as digits as its factorization.

15664855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3132976.

The product of its digits is 144000, while the sum is 40.

The square root of 15664855 is about 3957.8851676116. The cubic root of 15664855 is about 250.2123795287.

The spelling of 15664855 in words is "fifteen million, six hundred sixty-four thousand, eight hundred fifty-five".