66115773 has 6 divisors (see below), whose sum is σ = 95500574. Its totient is φ = 44077176.

The previous prime is 66115769. The next prime is 66115799. The reversal of 66115773 is 37751166.

It can be written as a sum of positive squares in only one way, i.e., 40985604 + 25130169 = 6402^2 + 5013^2 .

It is not a de Polignac number, because 66115773 - 2² = 66115769 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 (66115723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3673090 + ... + 3673107.

Almost surely, 2^66115773 is an apocalyptic number.

It is an amenable number.

66115773 is a deficient number, since it is larger than the sum of its proper divisors (29384801).

66115773 is a wasteful number, since it uses less digits than its factorization.

66115773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7346203 (or 7346200 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 66115773 is about 8131.1606182635. The cubic root of 66115773 is about 404.3601602339.

The spelling of 66115773 in words is "sixty-six million, one hundred fifteen thousand, seven hundred seventy-three".