13666656240 has 120 divisors (see below), whose sum is σ = 46873839168. Its totient is φ = 3566891520.

The previous prime is 13666656191. The next prime is 13666656253. The reversal of 13666656240 is 4265666631.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168091 + ... + 235770.

Almost surely, 2^13666656240 is an apocalyptic number.

13666656240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13666656240 is an abundant number, since it is smaller than the sum of its proper divisors (33207182928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13666656240 is a wasteful number, since it uses less digits than its factorization.

13666656240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 403927 (or 403918 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 13666656240 in words is "thirteen billion, six hundred sixty-six million, six hundred fifty-six thousand, two hundred forty".