639814533120 has 544 divisors, whose sum is σ = 2600113098240. Its totient is φ = 146229166080.

The previous prime is 639814533091. The next prime is 639814533133. The reversal of 639814533120 is 21335418936.

639814533120 is a `hidden beast` number, since 6 + 3 + 98 + 1 + 4 + 533 + 1 + 20 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61926355 + ... + 61936685.

Almost surely, 2^639814533120 is an apocalyptic number.

639814533120 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 639814533120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300056549120).

639814533120 is an abundant number, since it is smaller than the sum of its proper divisors (1960298565120).

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

639814533120 is an equidigital number, since it uses as much as digits as its factorization.

639814533120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10384 (or 10348 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The spelling of 639814533120 in words is "six hundred thirty-nine billion, eight hundred fourteen million, five hundred thirty-three thousand, one hundred twenty".