65995815674880 has 2640 divisors, whose sum is σ = 298682416460736. Its totient is φ = 13810852823040.

The previous prime is 65995815674869. The next prime is 65995815674909. The reversal of 65995815674880 is 8847651859956.

65995815674880 is a `hidden beast` number, since 6 + 5 + 9 + 9 + 5 + 8 + 1 + 567 + 48 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a self number, because there is not a number n which added to its sum of digits gives 65995815674880.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 34607138887 + ... + 34607140793.

Almost surely, 2^{65995815674880} is an apocalyptic number.

65995815674880 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 65995815674880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149341208230368).

65995815674880 is an abundant number, since it is smaller than the sum of its proper divisors (232686600785856).

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

65995815674880 is a wasteful number, since it uses less digits than its factorization.

65995815674880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102 (or 2068 counting only the distinct ones).

The product of its (nonzero) digits is 5225472000, while the sum is 81.

The spelling of 65995815674880 in words is "sixty-five trillion, nine hundred ninety-five billion, eight hundred fifteen million, six hundred seventy-four thousand, eight hundred eighty".