66408781452 has 48 divisors (see below), whose sum is σ = 174128720640. Its totient is φ = 19545058368.

The previous prime is 66408781451. The next prime is 66408781463. The reversal of 66408781452 is 25418780466.

It is a super-3 number, since 3×66408781452³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66408781395 and 66408781404.

It is not an unprimeable number, because it can be changed into a prime (66408781451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9250702 + ... + 9257877.

It is an arithmetic number, because the mean of its divisors is an integer number (3627681680).

Almost surely, 2^66408781452 is an apocalyptic number.

It is an amenable number.

66408781452 is an abundant number, since it is smaller than the sum of its proper divisors (107719939188).

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

66408781452 is a wasteful number, since it uses less digits than its factorization.

66408781452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18508622 (or 18508620 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 51.

The spelling of 66408781452 in words is "sixty-six billion, four hundred eight million, seven hundred eighty-one thousand, four hundred fifty-two".