66330538 has 16 divisors (see below), whose sum is σ = 102944520. Its totient is φ = 32032000.

The previous prime is 66330503. The next prime is 66330541. The reversal of 66330538 is 83503366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 60264169 + 6066369 = 7763^2 + 2463^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4278 + ... + 12286.

Almost surely, 2^66330538 is an apocalyptic number.

66330538 is a deficient number, since it is larger than the sum of its proper divisors (36613982).

66330538 is a wasteful number, since it uses less digits than its factorization.

66330538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8153.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 66330538 is about 8144.3562053731. The cubic root of 66330538 is about 404.7975170332.

The spelling of 66330538 in words is "sixty-six million, three hundred thirty thousand, five hundred thirty-eight".