65398375680 has 576 divisors, whose sum is σ = 234187849728. Its totient is φ = 15420948480.

The previous prime is 65398375657. The next prime is 65398375681. The reversal of 65398375680 is 8657389356.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65398375681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 391606957 + ... + 391607123.

It is an arithmetic number, because the mean of its divisors is an integer number (406576128).

Almost surely, 2^65398375680 is an apocalyptic number.

65398375680 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 65398375680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117093924864).

65398375680 is an abundant number, since it is smaller than the sum of its proper divisors (168789474048).

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

65398375680 is a wasteful number, since it uses less digits than its factorization.

65398375680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 60.

The spelling of 65398375680 in words is "sixty-five billion, three hundred ninety-eight million, three hundred seventy-five thousand, six hundred eighty".