64255516993500 has 288 divisors, whose sum is σ = 217680613113600. Its totient is φ = 14685650179200.

The previous prime is 64255516993471. The next prime is 64255516993511. The reversal of 64255516993500 is 539961555246.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 980383731 + ... + 980449269.

It is an arithmetic number, because the mean of its divisors is an integer number (755835462200).

Almost surely, 2^{64255516993500} is an apocalyptic number.

64255516993500 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 64255516993500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108840306556800).

64255516993500 is an abundant number, since it is smaller than the sum of its proper divisors (153425096120100).

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

64255516993500 is a wasteful number, since it uses less digits than its factorization.

64255516993500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78914 (or 78895 counting only the distinct ones).

The product of its (nonzero) digits is 43740000, while the sum is 60.

The spelling of 64255516993500 in words is "sixty-four trillion, two hundred fifty-five billion, five hundred sixteen million, nine hundred ninety-three thousand, five hundred".