6687997793 has 4 divisors (see below), whose sum is σ = 6696085680. Its totient is φ = 6679909908.

The previous prime is 6687997787. The next prime is 6687997801. The reversal of 6687997793 is 3977997866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6687997793 - 2²⁶ = 6620888929 is a prime.

It is a super-3 number, since 3×6687997793³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6687937793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4042703 + ... + 4044356.

It is an arithmetic number, because the mean of its divisors is an integer number (1674021420).

Almost surely, 2^6687997793 is an apocalyptic number.

It is an amenable number.

6687997793 is a deficient number, since it is larger than the sum of its proper divisors (8087887).

6687997793 is an equidigital number, since it uses as much as digits as its factorization.

6687997793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087886.

The product of its digits is 216040608, while the sum is 71.

The square root of 6687997793 is about 81780.1797075551. The cubic root of 6687997793 is about 1884.0772564646.

The spelling of 6687997793 in words is "six billion, six hundred eighty-seven million, nine hundred ninety-seven thousand, seven hundred ninety-three".