135666669 has 16 divisors (see below), whose sum is σ = 196977600. Its totient is φ = 82728576.

The previous prime is 135666659. The next prime is 135666689. The reversal of 135666669 is 966666531.

135666669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 135666669 - 2⁵ = 135666637 is a prime.

It is a super-2 number, since 2×135666669² = 36810890155111122, which contains 22 as substring.

It is a Curzon number.

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 (135666659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39384 + ... + 42689.

It is an arithmetic number, because the mean of its divisors is an integer number (12311100).

Almost surely, 2^135666669 is an apocalyptic number.

135666669 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

135666669 is a deficient number, since it is larger than the sum of its proper divisors (61310931).

135666669 is a wasteful number, since it uses less digits than its factorization.

135666669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82124.

The product of its digits is 1049760, while the sum is 48.

The square root of 135666669 is about 11647.6035732678. The cubic root of 135666669 is about 513.8358333036.

The spelling of 135666669 in words is "one hundred thirty-five million, six hundred sixty-six thousand, six hundred sixty-nine".