66188347612 has 24 divisors (see below), whose sum is σ = 121146181632. Its totient is φ = 31581831600.

The previous prime is 66188347609. The next prime is 66188347613. The reversal of 66188347612 is 21674388166.

It is a super-4 number, since 4×66188347612⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 66188347612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66188347613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794964 + ... + 874267.

It is an arithmetic number, because the mean of its divisors is an integer number (5047757568).

Almost surely, 2^66188347612 is an apocalyptic number.

It is an amenable number.

66188347612 is a deficient number, since it is larger than the sum of its proper divisors (54957834020).

66188347612 is a wasteful number, since it uses less digits than its factorization.

66188347612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669689 (or 1669687 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The spelling of 66188347612 in words is "sixty-six billion, one hundred eighty-eight million, three hundred forty-seven thousand, six hundred twelve".