639853455360 has 384 divisors, whose sum is σ = 2348011411200. Its totient is φ = 145717985280.

The previous prime is 639853455343. The next prime is 639853455389. The reversal of 639853455360 is 63554358936.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×639853455360² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 639853455360.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60420946 + ... + 60431534.

It is an arithmetic number, because the mean of its divisors is an integer number (6114613050).

Almost surely, 2^639853455360 is an apocalyptic number.

639853455360 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 639853455360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1174005705600).

639853455360 is an abundant number, since it is smaller than the sum of its proper divisors (1708157955840).

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

639853455360 is a wasteful number, since it uses less digits than its factorization.

639853455360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10907 (or 10887 counting only the distinct ones).

The product of its (nonzero) digits is 34992000, while the sum is 57.

The spelling of 639853455360 in words is "six hundred thirty-nine billion, eight hundred fifty-three million, four hundred fifty-five thousand, three hundred sixty".