65418899399040 has 256 divisors, whose sum is σ = 227491035287040. Its totient is φ = 15858312806400.

The previous prime is 65418899399027. The next prime is 65418899399053. The reversal of 65418899399040 is 4099399881456.

It is an interprime number because it is at equal distance from previous prime (65418899399027) and next prime (65418899399053).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 479799357 + ... + 479935683.

It is an arithmetic number, because the mean of its divisors is an integer number (888636856590).

Almost surely, 2^{65418899399040} is an apocalyptic number.

65418899399040 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 65418899399040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113745517643520).

65418899399040 is an abundant number, since it is smaller than the sum of its proper divisors (162072135888000).

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

65418899399040 is a wasteful number, since it uses less digits than its factorization.

65418899399040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159081 (or 159069 counting only the distinct ones).

The product of its (nonzero) digits is 604661760, while the sum is 75.

The spelling of 65418899399040 in words is "sixty-five trillion, four hundred eighteen billion, eight hundred ninety-nine million, three hundred ninety-nine thousand, forty".