66187116512 has 96 divisors (see below), whose sum is σ = 149876697600. Its totient is φ = 28455321600.

The previous prime is 66187116473. The next prime is 66187116547. The reversal of 66187116512 is 21561178166.

It is a super-2 number, since 2×66187116512² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

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, 4279289 + ... + 4294727.

It is an arithmetic number, because the mean of its divisors is an integer number (1561215600).

Almost surely, 2^66187116512 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 66187116512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74938348800).

66187116512 is an abundant number, since it is smaller than the sum of its proper divisors (83689581088).

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

66187116512 is a wasteful number, since it uses less digits than its factorization.

66187116512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16120 (or 16112 counting only the distinct ones).

The product of its digits is 120960, while the sum is 44.

The spelling of 66187116512 in words is "sixty-six billion, one hundred eighty-seven million, one hundred sixteen thousand, five hundred twelve".