66555643752 has 48 divisors (see below), whose sum is σ = 194120630340. Its totient is φ = 20478659328.

The previous prime is 66555643751. The next prime is 66555643753. The reversal of 66555643752 is 25734655566.

66555643752 is a `hidden beast` number, since 6 + 6 + 5 + 5 + 564 + 3 + 75 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (66555643751) and next prime (66555643753).

It can be written as a sum of positive squares in 2 ways, for example, as 48332263716 + 18223380036 = 219846^2 + 134994^2 .

It is not an unprimeable number, because it can be changed into a prime (66555643751) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35552293 + ... + 35554164.

Almost surely, 2^66555643752 is an apocalyptic number.

It is an amenable number.

66555643752 is an abundant number, since it is smaller than the sum of its proper divisors (127564986588).

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

66555643752 is a wasteful number, since it uses less digits than its factorization.

66555643752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71106482 (or 71106475 counting only the distinct ones).

The product of its digits is 22680000, while the sum is 54.

The spelling of 66555643752 in words is "sixty-six billion, five hundred fifty-five million, six hundred forty-three thousand, seven hundred fifty-two".