15669 has 6 divisors (see below), whose sum is σ = 22646. Its totient is φ = 10440.

The previous prime is 15667. The next prime is 15671. The reversal of 15669 is 96651.

It is an interprime number because it is at equal distance from previous prime (15667) and next prime (15671).

It can be written as a sum of positive squares in only one way, i.e., 8100 + 7569 = 90^2 + 87^2 .

It is not a de Polignac number, because 15669 - 2¹ = 15667 is a prime.

It is a super-2 number, since 2×15669² = 491035122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10 and base 15.

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 in 5 ways as a sum of consecutive naturals, for example, 862 + ... + 879.

2¹⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

15669 is a deficient number, since it is larger than the sum of its proper divisors (6977).

15669 is a wasteful number, since it uses less digits than its factorization.

15669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1747 (or 1744 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 15669 is about 125.1758762702. The cubic root of 15669 is about 25.0234446737.

It can be divided in two parts, 156 and 69, that added together give a square (225 = 15²).

The spelling of 15669 in words is "fifteen thousand, six hundred sixty-nine".