6400620025500 has 384 divisors, whose sum is σ = 19335877456896. Its totient is φ = 1644209280000.

The previous prime is 6400620025489. The next prime is 6400620025517. The reversal of 6400620025500 is 55200260046.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1804514727 + ... + 1804518273.

It is an arithmetic number, because the mean of its divisors is an integer number (50353847544).

Almost surely, 2^{6400620025500} is an apocalyptic number.

6400620025500 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 6400620025500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9667938728448).

6400620025500 is an abundant number, since it is smaller than the sum of its proper divisors (12935257431396).

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

6400620025500 is a wasteful number, since it uses less digits than its factorization.

6400620025500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3990 (or 3978 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 6400620025500 its reverse (55200260046), we get a palindrome (6455820285546).

The spelling of 6400620025500 in words is "six trillion, four hundred billion, six hundred twenty million, twenty-five thousand, five hundred".