65297797800 has 384 divisors, whose sum is σ = 221557248000. Its totient is φ = 15845760000.

The previous prime is 65297797727. The next prime is 65297797849. The reversal of 65297797800 is 879779256.

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 95 ways as a sum of consecutive naturals, for example, 86947425 + ... + 86948175.

It is an arithmetic number, because the mean of its divisors is an integer number (576972000).

Almost surely, 2^65297797800 is an apocalyptic number.

65297797800 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 65297797800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110778624000).

65297797800 is an abundant number, since it is smaller than the sum of its proper divisors (156259450200).

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

65297797800 is a wasteful number, since it uses less digits than its factorization.

65297797800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081 (or 1072 counting only the distinct ones).

The product of its (nonzero) digits is 13335840, while the sum is 60.

The spelling of 65297797800 in words is "sixty-five billion, two hundred ninety-seven million, seven hundred ninety-seven thousand, eight hundred".