6638998366 has 96 divisors (see below), whose sum is σ = 13618713600. Its totient is φ = 2356698240.

The previous prime is 6638998363. The next prime is 6638998381.

6638998366 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6638998298 and 6638998307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638998361) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 2054440 + ... + 2057668.

It is an arithmetic number, because the mean of its divisors is an integer number (141861600).

Almost surely, 2^6638998366 is an apocalyptic number.

6638998366 is an abundant number, since it is smaller than the sum of its proper divisors (6979715234).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6638998366 is a wasteful number, since it uses less digits than its factorization.

6638998366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3354 (or 3341 counting only the distinct ones).

The product of its digits is 60466176, while the sum is 64.

The square root of 6638998366 is about 81480.0488831468. The cubic root of 6638998366 is about 1879.4647606760.

The spelling of 6638998366 in words is "six billion, six hundred thirty-eight million, nine hundred ninety-eight thousand, three hundred sixty-six".