6988694881 has 4 divisors (see below), whose sum is σ = 7987079872. Its totient is φ = 5990309892.

The previous prime is 6988694873. The next prime is 6988694953. The reversal of 6988694881 is 1884968896.

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 not a de Polignac number, because 6988694881 - 2³ = 6988694873 is a prime.

It is a super-2 number, since 2×6988694881² = 97683712279431208322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6988694821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 499192485 + ... + 499192498.

It is an arithmetic number, because the mean of its divisors is an integer number (1996769968).

Almost surely, 2^6988694881 is an apocalyptic number.

It is an amenable number.

6988694881 is a deficient number, since it is larger than the sum of its proper divisors (998384991).

6988694881 is an equidigital number, since it uses as much as digits as its factorization.

6988694881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998384990.

The product of its digits is 47775744, while the sum is 67.

The square root of 6988694881 is about 83598.4143450102. The cubic root of 6988694881 is about 1911.9008224300.

The spelling of 6988694881 in words is "six billion, nine hundred eighty-eight million, six hundred ninety-four thousand, eight hundred eighty-one".