66231304720 has 60 divisors (see below), whose sum is σ = 179128656684. Its totient is φ = 22707874560.

The previous prime is 66231304709. The next prime is 66231304721. The reversal of 66231304720 is 2740313266.

It can be written as a sum of positive squares in 2 ways, for example, as 42549788176 + 23681516544 = 206276^2 + 153888^2 .

It is not an unprimeable number, because it can be changed into a prime (66231304721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8443951 + ... + 8451790.

Almost surely, 2^66231304720 is an apocalyptic number.

It is an amenable number.

66231304720 is an abundant number, since it is smaller than the sum of its proper divisors (112897351964).

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

66231304720 is a wasteful number, since it uses less digits than its factorization.

66231304720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16895768 (or 16895755 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

Adding to 66231304720 its reverse (2740313266), we get a palindrome (68971617986).

The spelling of 66231304720 in words is "sixty-six billion, two hundred thirty-one million, three hundred four thousand, seven hundred twenty".