6666137287 has 8 divisors (see below), whose sum is σ = 6902380800. Its totient is φ = 6430318944.

The previous prime is 6666137273. The next prime is 6666137339. The reversal of 6666137287 is 7827316666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6666137287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666137267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74212 + ... + 137257.

It is an arithmetic number, because the mean of its divisors is an integer number (862797600).

Almost surely, 2^6666137287 is an apocalyptic number.

6666137287 is a deficient number, since it is larger than the sum of its proper divisors (236243513).

6666137287 is a wasteful number, since it uses less digits than its factorization.

6666137287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212585.

The product of its digits is 3048192, while the sum is 52.

The square root of 6666137287 is about 81646.4162532563. The cubic root of 6666137287 is about 1882.0222399095.

The spelling of 6666137287 in words is "six billion, six hundred sixty-six million, one hundred thirty-seven thousand, two hundred eighty-seven".