66115861773 has 24 divisors (see below), whose sum is σ = 95623080768. Its totient is φ = 40615990272.

The previous prime is 66115861759. The next prime is 66115861811. The reversal of 66115861773 is 37716851166.

It is not a de Polignac number, because 66115861773 - 2⁵ = 66115861741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66115861753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 179536 + ... + 405542.

It is an arithmetic number, because the mean of its divisors is an integer number (3984295032).

Almost surely, 2^66115861773 is an apocalyptic number.

It is an amenable number.

66115861773 is a deficient number, since it is larger than the sum of its proper divisors (29507218995).

66115861773 is a wasteful number, since it uses less digits than its factorization.

66115861773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226613 (or 226600 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 51.

The spelling of 66115861773 in words is "sixty-six billion, one hundred fifteen million, eight hundred sixty-one thousand, seven hundred seventy-three".