66566552472 has 96 divisors (see below), whose sum is σ = 206498916000. Its totient is φ = 18976591872.

The previous prime is 66566552449. The next prime is 66566552473. The reversal of 66566552472 is 27425566566.

66566552472 is a `hidden beast` number, since 6 + 6 + 56 + 65 + 524 + 7 + 2 = 666.

It is a super-2 number, since 2×66566552472² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66566552473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79218 + ... + 373374.

It is an arithmetic number, because the mean of its divisors is an integer number (2151030375).

Almost surely, 2^66566552472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66566552472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103249458000).

66566552472 is an abundant number, since it is smaller than the sum of its proper divisors (139932363528).

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

66566552472 is a wasteful number, since it uses less digits than its factorization.

66566552472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294625 (or 294618 counting only the distinct ones).

The product of its digits is 18144000, while the sum is 54.

The spelling of 66566552472 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, four hundred seventy-two".