639942228000000 has 1008 divisors, whose sum is σ = 2381223132453760. Its totient is φ = 169516800000000.

The previous prime is 639942227999969. The next prime is 639942228000071. The reversal of 639942228000000 is 822249936.

639942228000000 is a `hidden beast` number, since 63 + 99 + 422 + 2 + 80 + 0 + 0 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 639942228000000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 16307980380 + ... + 16308019620.

Almost surely, 2^{639942228000000} is an apocalyptic number.

639942228000000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639942228000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190611566226880).

639942228000000 is an abundant number, since it is smaller than the sum of its proper divisors (1741280904453760).

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

639942228000000 is an frugal number, since it uses more digits than its factorization.

639942228000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39447 (or 39402 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 639942228000000 in words is "six hundred thirty-nine trillion, nine hundred forty-two billion, two hundred twenty-eight million", and thus it is an aban number.