66609240578 has 32 divisors (see below), whose sum is σ = 102324539520. Its totient is φ = 32510974720.

The previous prime is 66609240563. The next prime is 66609240613. The reversal of 66609240578 is 87504290666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22896188 + ... + 22899096.

It is an arithmetic number, because the mean of its divisors is an integer number (3197641860).

Almost surely, 2^66609240578 is an apocalyptic number.

66609240578 is a deficient number, since it is larger than the sum of its proper divisors (35715298942).

66609240578 is a wasteful number, since it uses less digits than its factorization.

66609240578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4522.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 66609240578 in words is "sixty-six billion, six hundred nine million, two hundred forty thousand, five hundred seventy-eight".