66566647424 has 32 divisors (see below), whose sum is σ = 135697283040. Its totient is φ = 32509290240.

The previous prime is 66566647333. The next prime is 66566647429. The reversal of 66566647424 is 42474666566.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×66566647424² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66566647424.

It is not an unprimeable number, because it can be changed into a prime (66566647429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6041612 + ... + 6052619.

It is an arithmetic number, because the mean of its divisors is an integer number (4240540095).

Almost surely, 2^66566647424 is an apocalyptic number.

66566647424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66566647424 is an abundant number, since it is smaller than the sum of its proper divisors (69130635616).

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

66566647424 is a wasteful number, since it uses less digits than its factorization.

66566647424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12094288 (or 12094276 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 56.

The spelling of 66566647424 in words is "sixty-six billion, five hundred sixty-six million, six hundred forty-seven thousand, four hundred twenty-four".