66312938 has 4 divisors (see below), whose sum is σ = 99469410. Its totient is φ = 33156468.

The previous prime is 66312931. The next prime is 66312941. The reversal of 66312938 is 83921366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 66308449 + 4489 = 8143^2 + 67^2 .

It is not an unprimeable number, because it can be changed into a prime (66312931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16578233 + ... + 16578236.

Almost surely, 2^66312938 is an apocalyptic number.

66312938 is a deficient number, since it is larger than the sum of its proper divisors (33156472).

66312938 is a wasteful number, since it uses less digits than its factorization.

66312938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33156471.

The product of its digits is 46656, while the sum is 38.

The square root of 66312938 is about 8143.2756308503. The cubic root of 66312938 is about 404.7617111699.

The spelling of 66312938 in words is "sixty-six million, three hundred twelve thousand, nine hundred thirty-eight".