66661330 has 8 divisors (see below), whose sum is σ = 119990412. Its totient is φ = 26664528.

The previous prime is 66661319. The next prime is 66661339. The reversal of 66661330 is 3316666.

It can be written as a sum of positive squares in 2 ways, for example, as 65141041 + 1520289 = 8071^2 + 1233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 66661292 and 66661301.

It is not an unprimeable number, because it can be changed into a prime (66661339) 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, 3333057 + ... + 3333076.

Almost surely, 2^66661330 is an apocalyptic number.

66661330 is a deficient number, since it is larger than the sum of its proper divisors (53329082).

66661330 is a wasteful number, since it uses less digits than its factorization.

66661330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6666140.

The product of its (nonzero) digits is 11664, while the sum is 31.

The square root of 66661330 is about 8164.6389999803. The cubic root of 66661330 is about 405.4693131880.

Adding to 66661330 its reverse (3316666), we get a palindrome (69977996).

The spelling of 66661330 in words is "sixty-six million, six hundred sixty-one thousand, three hundred thirty".