66805125683 has 4 divisors (see below), whose sum is σ = 67429472760. Its totient is φ = 66180778608.

The previous prime is 66805125671. The next prime is 66805125707. The reversal of 66805125683 is 38652150866.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66805125683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66805125623) 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, 312173378 + ... + 312173591.

It is an arithmetic number, because the mean of its divisors is an integer number (16857368190).

Almost surely, 2^66805125683 is an apocalyptic number.

66805125683 is a deficient number, since it is larger than the sum of its proper divisors (624347077).

66805125683 is a wasteful number, since it uses less digits than its factorization.

66805125683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624347076.

The product of its (nonzero) digits is 2073600, while the sum is 50.

The spelling of 66805125683 in words is "sixty-six billion, eight hundred five million, one hundred twenty-five thousand, six hundred eighty-three".