6687946399 has 8 divisors (see below), whose sum is σ = 6761659968. Its totient is φ = 6614593920.

The previous prime is 6687946381. The next prime is 6687946409. The reversal of 6687946399 is 9936497866.

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 6687946399 - 2⁵ = 6687946367 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 (6687941399) 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, 52942 + ... + 127195.

It is an arithmetic number, because the mean of its divisors is an integer number (845207496).

Almost surely, 2^6687946399 is an apocalyptic number.

6687946399 is a deficient number, since it is larger than the sum of its proper divisors (73713569).

6687946399 is a wasteful number, since it uses less digits than its factorization.

6687946399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180545.

The product of its digits is 105815808, while the sum is 67.

The square root of 6687946399 is about 81779.8654865609. The cubic root of 6687946399 is about 1884.0724303807.

The spelling of 6687946399 in words is "six billion, six hundred eighty-seven million, nine hundred forty-six thousand, three hundred ninety-nine".