66505063333440 has 224 divisors, whose sum is σ = 215680072250880. Its totient is φ = 17354623942656.

The previous prime is 66505063333403. The next prime is 66505063333463. The reversal of 66505063333440 is 4433336050566.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 66505063333440.

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, 295558896 + ... + 295783824.

Almost surely, 2^{66505063333440} is an apocalyptic number.

66505063333440 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 66505063333440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107840036125440).

66505063333440 is an abundant number, since it is smaller than the sum of its proper divisors (149175008917440).

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

66505063333440 is a wasteful number, since it uses less digits than its factorization.

66505063333440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231549 (or 231539 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 48.

The spelling of 66505063333440 in words is "sixty-six trillion, five hundred five billion, sixty-three million, three hundred thirty-three thousand, four hundred forty".