6638888905 has 8 divisors (see below), whose sum is σ = 8690909184. Its totient is φ = 4828282800.

The previous prime is 6638888897. The next prime is 6638888923. The reversal of 6638888905 is 5098888366.

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

It is not a de Polignac number, because 6638888905 - 2³ = 6638888897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60353481 + ... + 60353590.

It is an arithmetic number, because the mean of its divisors is an integer number (1086363648).

Almost surely, 2^6638888905 is an apocalyptic number.

It is an amenable number.

6638888905 is a deficient number, since it is larger than the sum of its proper divisors (2052020279).

6638888905 is a wasteful number, since it uses less digits than its factorization.

6638888905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120707087.

The product of its (nonzero) digits is 19906560, while the sum is 61.

The square root of 6638888905 is about 81479.3771760683. The cubic root of 6638888905 is about 1879.4544313456.

The spelling of 6638888905 in words is "six billion, six hundred thirty-eight million, eight hundred eighty-eight thousand, nine hundred five".