639309853350 has 144 divisors (see below), whose sum is σ = 1963644839520. Its totient is φ = 146078899200.

The previous prime is 639309853327. The next prime is 639309853381. The reversal of 639309853350 is 53358903936.

639309853350 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9798636 + ... + 9863664.

Almost surely, 2^639309853350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639309853350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (981822419760).

639309853350 is an abundant number, since it is smaller than the sum of its proper divisors (1324334986170).

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

639309853350 is a wasteful number, since it uses less digits than its factorization.

639309853350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68175 (or 68167 counting only the distinct ones).

The product of its (nonzero) digits is 7873200, while the sum is 54.

The spelling of 639309853350 in words is "six hundred thirty-nine billion, three hundred nine million, eight hundred fifty-three thousand, three hundred fifty".