66740747472 has 160 divisors (see below), whose sum is σ = 219392307200. Its totient is φ = 19029209472.

The previous prime is 66740747443. The next prime is 66740747477. The reversal of 66740747472 is 27474704766.

It is a happy number.

66740747472 is a `hidden beast` number, since 6 + 67 + 40 + 7 + 474 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66740747477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1450029 + ... + 1495347.

It is an arithmetic number, because the mean of its divisors is an integer number (1371201920).

Almost surely, 2^66740747472 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 66740747472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109696153600).

66740747472 is an abundant number, since it is smaller than the sum of its proper divisors (152651559728).

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

66740747472 is a wasteful number, since it uses less digits than its factorization.

66740747472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45830 (or 45818 counting only the distinct ones).

The product of its (nonzero) digits is 11063808, while the sum is 54.

The spelling of 66740747472 in words is "sixty-six billion, seven hundred forty million, seven hundred forty-seven thousand, four hundred seventy-two".