13666078 has 4 divisors (see below), whose sum is σ = 20499120. Its totient is φ = 6833038.

The previous prime is 13666069. The next prime is 13666091. The reversal of 13666078 is 87066631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87066631 = 31 ⋅2808601.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3416518 + ... + 3416521.

It is an arithmetic number, because the mean of its divisors is an integer number (5124780).

Almost surely, 2^13666078 is an apocalyptic number.

13666078 is a deficient number, since it is larger than the sum of its proper divisors (6833042).

13666078 is an equidigital number, since it uses as much as digits as its factorization.

13666078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6833041.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 13666078 is about 3696.7658838504. The cubic root of 13666078 is about 239.0825972225.

The spelling of 13666078 in words is "thirteen million, six hundred sixty-six thousand, seventy-eight".