15664441 has 12 divisors (see below), whose sum is σ = 17260560. Its totient is φ = 14205360.

The previous prime is 15664423. The next prime is 15664457. The reversal of 15664441 is 14446651.

It is not a de Polignac number, because 15664441 - 2⁵ = 15664409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15664421) 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 in 11 ways as a sum of consecutive naturals, for example, 9186 + ... + 10756.

It is an arithmetic number, because the mean of its divisors is an integer number (1438380).

Almost surely, 2^15664441 is an apocalyptic number.

It is an amenable number.

15664441 is a deficient number, since it is larger than the sum of its proper divisors (1596119).

15664441 is a wasteful number, since it uses less digits than its factorization.

15664441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656 (or 1643 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 15664441 is about 3957.8328666077. The cubic root of 15664441 is about 250.2101752559.

The spelling of 15664441 in words is "fifteen million, six hundred sixty-four thousand, four hundred forty-one".