66640930 has 8 divisors (see below), whose sum is σ = 119953692. Its totient is φ = 26656368.

The previous prime is 66640883. The next prime is 66640943. The reversal of 66640930 is 3904666.

It can be written as a sum of positive squares in 2 ways, for example, as 65561409 + 1079521 = 8097^2 + 1039^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3332037 + ... + 3332056.

Almost surely, 2^66640930 is an apocalyptic number.

66640930 is a deficient number, since it is larger than the sum of its proper divisors (53312762).

66640930 is a wasteful number, since it uses less digits than its factorization.

66640930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6664100.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 66640930 is about 8163.3896146148. The cubic root of 66640930 is about 405.4279477872.

The spelling of 66640930 in words is "sixty-six million, six hundred forty thousand, nine hundred thirty".