66187321212 has 48 divisors (see below), whose sum is σ = 165140694432. Its totient is φ = 20559052800.

The previous prime is 66187321201. The next prime is 66187321253. The reversal of 66187321212 is 21212378166.

It is a super-2 number, since 2×66187321212² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1585573 + ... + 1626780.

It is an arithmetic number, because the mean of its divisors is an integer number (3440431134).

Almost surely, 2^66187321212 is an apocalyptic number.

It is an amenable number.

66187321212 is an abundant number, since it is smaller than the sum of its proper divisors (98953373220).

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

66187321212 is a wasteful number, since it uses less digits than its factorization.

66187321212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3212478 (or 3212476 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

Adding to 66187321212 its reverse (21212378166), we get a palindrome (87399699378).

The spelling of 66187321212 in words is "sixty-six billion, one hundred eighty-seven million, three hundred twenty-one thousand, two hundred twelve".