66193239744 has 112 divisors (see below), whose sum is σ = 195836133600. Its totient is φ = 21923785728.

The previous prime is 66193239743. The next prime is 66193239751. The reversal of 66193239744 is 44793239166.

It is a happy number.

66193239744 is a `hidden beast` number, since 66 + 193 + 2 + 397 + 4 + 4 = 666.

It is a super-2 number, since 2×66193239744² (a number of 22 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (66193239743) 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 15 ways as a sum of consecutive naturals, for example, 149302 + ... + 393290.

Almost surely, 2^66193239744 is an apocalyptic number.

66193239744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66193239744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97918066800).

66193239744 is an abundant number, since it is smaller than the sum of its proper divisors (129642893856).

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

66193239744 is a wasteful number, since it uses less digits than its factorization.

66193239744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244167 (or 244151 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 54.

The spelling of 66193239744 in words is "sixty-six billion, one hundred ninety-three million, two hundred thirty-nine thousand, seven hundred forty-four".