66231632 has 10 divisors (see below), whose sum is σ = 128323818. Its totient is φ = 33115808.

The previous prime is 66231631. The next prime is 66231647. The reversal of 66231632 is 23613266.

It can be written as a sum of positive squares in only one way, i.e., 49224256 + 17007376 = 7016^2 + 4124^2 .

It is a junction number, because it is equal to n+sod(n) for n = 66231595 and 66231604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66231631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2069723 + ... + 2069754.

Almost surely, 2^66231632 is an apocalyptic number.

It is an amenable number.

66231632 is a deficient number, since it is larger than the sum of its proper divisors (62092186).

66231632 is a wasteful number, since it uses less digits than its factorization.

66231632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4139485 (or 4139479 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 66231632 is about 8138.2818825597. The cubic root of 66231632 is about 404.5962180000.

Adding to 66231632 its reverse (23613266), we get a palindrome (89844898).

The spelling of 66231632 in words is "sixty-six million, two hundred thirty-one thousand, six hundred thirty-two".