66060805973 has 4 divisors (see below), whose sum is σ = 66250092300. Its totient is φ = 65871519648.

The previous prime is 66060805913. The next prime is 66060805981. The reversal of 66060805973 is 37950806066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56960027569 + 9100778404 = 238663^2 + 95398^2 .

It is a cyclic number.

It is not a de Polignac number, because 66060805973 - 2⁸ = 66060805717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66060805913) 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, 94642640 + ... + 94643337.

It is an arithmetic number, because the mean of its divisors is an integer number (16562523075).

Almost surely, 2^66060805973 is an apocalyptic number.

It is an amenable number.

66060805973 is a deficient number, since it is larger than the sum of its proper divisors (189286327).

66060805973 is a wasteful number, since it uses less digits than its factorization.

66060805973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189286326.

The product of its (nonzero) digits is 1632960, while the sum is 50.

The spelling of 66060805973 in words is "sixty-six billion, sixty million, eight hundred five thousand, nine hundred seventy-three".