6691366639 has 8 divisors (see below), whose sum is σ = 6873702048. Its totient is φ = 6509109600.

The previous prime is 6691366631. The next prime is 6691366657. The reversal of 6691366639 is 9366631966.

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

It is a cyclic number.

It is not a de Polignac number, because 6691366639 - 2³ = 6691366631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6691366639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691366631) 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, 181089 + ... + 214885.

It is an arithmetic number, because the mean of its divisors is an integer number (859212756).

Almost surely, 2^6691366639 is an apocalyptic number.

6691366639 is a deficient number, since it is larger than the sum of its proper divisors (182335409).

6691366639 is a wasteful number, since it uses less digits than its factorization.

6691366639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39185.

The product of its digits is 5668704, while the sum is 55.

The square root of 6691366639 is about 81800.7740733546. The cubic root of 6691366639 is about 1884.3935494670.

The spelling of 6691366639 in words is "six billion, six hundred ninety-one million, three hundred sixty-six thousand, six hundred thirty-nine".