6691887331 has 12 divisors (see below), whose sum is σ = 6816209400. Its totient is φ = 6569787840.

The previous prime is 6691887311. The next prime is 6691887347. The reversal of 6691887331 is 1337881966.

It is not a de Polignac number, because 6691887331 - 2⁵ = 6691887299 is a prime.

It is a super-2 number, since 2×6691887331² = 89562712101596607122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691887311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2450775 + ... + 2453503.

It is an arithmetic number, because the mean of its divisors is an integer number (568017450).

Almost surely, 2^6691887331 is an apocalyptic number.

6691887331 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

6691887331 is a deficient number, since it is larger than the sum of its proper divisors (124322069).

6691887331 is an equidigital number, since it uses as much as digits as its factorization.

6691887331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510 (or 3449 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 52.

The square root of 6691887331 is about 81803.9566952602. The cubic root of 6691887331 is about 1884.4424265375.

The spelling of 6691887331 in words is "six billion, six hundred ninety-one million, eight hundred eighty-seven thousand, three hundred thirty-one".