66566552388 has 48 divisors (see below), whose sum is σ = 178218077184. Its totient is φ = 18943236000.

The previous prime is 66566552387. The next prime is 66566552389. The reversal of 66566552388 is 88325566566.

It is an interprime number because it is at equal distance from previous prime (66566552387) and next prime (66566552389).

It is a super-2 number, since 2×66566552388² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66566552387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1557520 + ... + 1599687.

It is an arithmetic number, because the mean of its divisors is an integer number (3712876608).

Almost surely, 2^66566552388 is an apocalyptic number.

It is an amenable number.

66566552388 is an abundant number, since it is smaller than the sum of its proper divisors (111651524796).

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

66566552388 is a wasteful number, since it uses less digits than its factorization.

66566552388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157472 (or 3157470 counting only the distinct ones).

The product of its digits is 62208000, while the sum is 60.

The spelling of 66566552388 in words is "sixty-six billion, five hundred sixty-six million, five hundred fifty-two thousand, three hundred eighty-eight".