639121833342 has 24 divisors (see below), whose sum is σ = 1384782254544. Its totient is φ = 213037798464.

The previous prime is 639121833247. The next prime is 639121833349. The reversal of 639121833342 is 243338121936.

639121833342 is a `hidden beast` number, since 6 + 3 + 91 + 218 + 3 + 3 + 342 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639121833349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1522983 + ... + 1896765.

It is an arithmetic number, because the mean of its divisors is an integer number (57699260606).

Almost surely, 2^639121833342 is an apocalyptic number.

639121833342 is an abundant number, since it is smaller than the sum of its proper divisors (745660421202).

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

639121833342 is a wasteful number, since it uses less digits than its factorization.

639121833342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468784 (or 468781 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The spelling of 639121833342 in words is "six hundred thirty-nine billion, one hundred twenty-one million, eight hundred thirty-three thousand, three hundred forty-two".