15668 has 6 divisors (see below), whose sum is σ = 27426. Its totient is φ = 7832.

The previous prime is 15667. The next prime is 15671. The reversal of 15668 is 86651.

It can be written as a sum of positive squares in only one way, i.e., 14884 + 784 = 122^2 + 28^2 .

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1955 + ... + 1962.

It is an arithmetic number, because the mean of its divisors is an integer number (4571).

2¹⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

15668 is a deficient number, since it is larger than the sum of its proper divisors (11758).

15668 is a wasteful number, since it uses less digits than its factorization.

15668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3921 (or 3919 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 15668 is about 125.1718818266. The cubic root of 15668 is about 25.0229123279.

The spelling of 15668 in words is "fifteen thousand, six hundred sixty-eight".