639113775660 has 384 divisors, whose sum is σ = 2230333056000. Its totient is φ = 150988271616.

The previous prime is 639113775637. The next prime is 639113775661. The reversal of 639113775660 is 66577311936.

639113775660 is a `hidden beast` number, since 6 + 3 + 9 + 1 + 1 + 3 + 77 + 566 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 639113775597 and 639113775606.

It is not an unprimeable number, because it can be changed into a prime (639113775661) by changing a digit.

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 127 ways as a sum of consecutive naturals, for example, 27372271 + ... + 27395609.

It is an arithmetic number, because the mean of its divisors is an integer number (5808159000).

Almost surely, 2^639113775660 is an apocalyptic number.

639113775660 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 639113775660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1115166528000).

639113775660 is an abundant number, since it is smaller than the sum of its proper divisors (1591219280340).

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

639113775660 is a wasteful number, since it uses less digits than its factorization.

639113775660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23550 (or 23542 counting only the distinct ones).

The product of its (nonzero) digits is 4286520, while the sum is 54.

The spelling of 639113775660 in words is "six hundred thirty-nine billion, one hundred thirteen million, seven hundred seventy-five thousand, six hundred sixty".