66974783232 has 288 divisors, whose sum is σ = 208012091392. Its totient is φ = 18736054272.

The previous prime is 66974783219. The next prime is 66974783233. The reversal of 66974783232 is 23238747966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66974783233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61613793 + ... + 61614879.

Almost surely, 2^66974783232 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 66974783232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104006045696).

66974783232 is an abundant number, since it is smaller than the sum of its proper divisors (141037308160).

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

66974783232 is a wasteful number, since it uses less digits than its factorization.

66974783232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1329 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 57.

The spelling of 66974783232 in words is "sixty-six billion, nine hundred seventy-four million, seven hundred eighty-three thousand, two hundred thirty-two".