6696841391 has 4 divisors (see below), whose sum is σ = 6988008432. Its totient is φ = 6405674352.

The previous prime is 6696841387. The next prime is 6696841397. The reversal of 6696841391 is 1931486966.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6696841391 - 2² = 6696841387 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 (6696841397) 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, 145583486 + ... + 145583531.

It is an arithmetic number, because the mean of its divisors is an integer number (1747002108).

Almost surely, 2^6696841391 is an apocalyptic number.

6696841391 is a deficient number, since it is larger than the sum of its proper divisors (291167041).

6696841391 is a wasteful number, since it uses less digits than its factorization.

6696841391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291167040.

The product of its digits is 1679616, while the sum is 53.

The square root of 6696841391 is about 81834.2311688697. The cubic root of 6696841391 is about 1884.9073346459.

The spelling of 6696841391 in words is "six billion, six hundred ninety-six million, eight hundred forty-one thousand, three hundred ninety-one".