6399772057320 has 256 divisors, whose sum is σ = 21471750432000. Its totient is φ = 1518842658816.

The previous prime is 6399772057319. The next prime is 6399772057333. The reversal of 6399772057320 is 237502779936.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1138464 + ... + 3754416.

It is an arithmetic number, because the mean of its divisors is an integer number (83874025125).

Almost surely, 2^{6399772057320} is an apocalyptic number.

6399772057320 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 6399772057320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10735875216000).

6399772057320 is an abundant number, since it is smaller than the sum of its proper divisors (15071978374680).

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

6399772057320 is a wasteful number, since it uses less digits than its factorization.

6399772057320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2616052 (or 2616048 counting only the distinct ones).

The product of its (nonzero) digits is 30005640, while the sum is 60.

The spelling of 6399772057320 in words is "six trillion, three hundred ninety-nine billion, seven hundred seventy-two million, fifty-seven thousand, three hundred twenty".