6688991031 has 8 divisors (see below), whose sum is σ = 9306422400. Its totient is φ = 4265443512.

The previous prime is 6688990967. The next prime is 6688991039. The reversal of 6688991031 is 1301998866.

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

It is not a de Polignac number, because 6688991031 - 2⁶ = 6688990967 is a prime.

It is a super-2 number, since 2×6688991031² = 89485202025596885922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688991039) 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, 48470881 + ... + 48471018.

It is an arithmetic number, because the mean of its divisors is an integer number (1163302800).

Almost surely, 2^6688991031 is an apocalyptic number.

6688991031 is a deficient number, since it is larger than the sum of its proper divisors (2617431369).

6688991031 is a wasteful number, since it uses less digits than its factorization.

6688991031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96941925.

The product of its (nonzero) digits is 559872, while the sum is 51.

The square root of 6688991031 is about 81786.2520904339. The cubic root of 6688991031 is about 1884.1705202761.

The spelling of 6688991031 in words is "six billion, six hundred eighty-eight million, nine hundred ninety-one thousand, thirty-one".