66231789412 has 12 divisors (see below), whose sum is σ = 118092530556. Its totient is φ = 32491066400.

The previous prime is 66231789373. The next prime is 66231789419. The reversal of 66231789412 is 21498713266.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 52639960356 + 13591829056 = 229434^2 + 116584^2 .

It is not an unprimeable number, because it can be changed into a prime (66231789419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156206839 + ... + 156207262.

It is an arithmetic number, because the mean of its divisors is an integer number (9841044213).

Almost surely, 2^66231789412 is an apocalyptic number.

It is an amenable number.

66231789412 is a deficient number, since it is larger than the sum of its proper divisors (51860741144).

66231789412 is a wasteful number, since it uses less digits than its factorization.

66231789412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312414158 (or 312414156 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The spelling of 66231789412 in words is "sixty-six billion, two hundred thirty-one million, seven hundred eighty-nine thousand, four hundred twelve".