6639632881 has 8 divisors (see below), whose sum is σ = 7764620864. Its totient is φ = 5558762160.

The previous prime is 6639632851. The next prime is 6639632941. The reversal of 6639632881 is 1882369366.

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

It is not a de Polignac number, because 6639632881 - 2¹⁵ = 6639600113 is a prime.

It is a super-3 number, since 3×6639632881³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (6639632851) 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, 11028990 + ... + 11029591.

It is an arithmetic number, because the mean of its divisors is an integer number (970577608).

Almost surely, 2^6639632881 is an apocalyptic number.

It is an amenable number.

6639632881 is a deficient number, since it is larger than the sum of its proper divisors (1124987983).

6639632881 is a wasteful number, since it uses less digits than its factorization.

6639632881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22058631.

The product of its digits is 2239488, while the sum is 52.

The square root of 6639632881 is about 81483.9424733487. The cubic root of 6639632881 is about 1879.5246346975.

The spelling of 6639632881 in words is "six billion, six hundred thirty-nine million, six hundred thirty-two thousand, eight hundred eighty-one".