6669853638 has 48 divisors (see below), whose sum is σ = 15573829104. Its totient is φ = 1898769600.

The previous prime is 6669853609. The next prime is 6669853699. The reversal of 6669853638 is 8363589666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40488 + ... + 122388.

It is an arithmetic number, because the mean of its divisors is an integer number (324454773).

Almost surely, 2^6669853638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6669853638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7786914552).

6669853638 is an abundant number, since it is smaller than the sum of its proper divisors (8903975466).

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

6669853638 is a wasteful number, since it uses less digits than its factorization.

6669853638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82197 (or 82190 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 60.

The square root of 6669853638 is about 81669.1718949078. The cubic root of 6669853638 is about 1882.3719154700.

The spelling of 6669853638 in words is "six billion, six hundred sixty-nine million, eight hundred fifty-three thousand, six hundred thirty-eight".