66351632 has 10 divisors (see below), whose sum is σ = 128556318. Its totient is φ = 33175808.

The previous prime is 66351569. The next prime is 66351683. The reversal of 66351632 is 23615366.

It can be written as a sum of positive squares in only one way, i.e., 66324736 + 26896 = 8144^2 + 164^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2073473 + ... + 2073504.

Almost surely, 2^66351632 is an apocalyptic number.

It is an amenable number.

66351632 is a deficient number, since it is larger than the sum of its proper divisors (62204686).

66351632 is a wasteful number, since it uses less digits than its factorization.

66351632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4146985 (or 4146979 counting only the distinct ones).

The product of its digits is 19440, while the sum is 32.

The square root of 66351632 is about 8145.6511096413. The cubic root of 66351632 is about 404.8404228303.

Adding to 66351632 its reverse (23615366), we get a palindrome (89966998).

The spelling of 66351632 in words is "sixty-six million, three hundred fifty-one thousand, six hundred thirty-two".