66873537 has 6 divisors (see below), whose sum is σ = 96595122. Its totient is φ = 44582352.

The previous prime is 66873533. The next prime is 66873553. The reversal of 66873537 is 73537866.

It can be written as a sum of positive squares in only one way, i.e., 52403121 + 14470416 = 7239^2 + 3804^2 .

It is not a de Polignac number, because 66873537 - 2² = 66873533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66873492 and 66873501.

It is not an unprimeable number, because it can be changed into a prime (66873533) 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, 3715188 + ... + 3715205.

It is an arithmetic number, because the mean of its divisors is an integer number (16099187).

Almost surely, 2^66873537 is an apocalyptic number.

It is an amenable number.

66873537 is a deficient number, since it is larger than the sum of its proper divisors (29721585).

66873537 is a wasteful number, since it uses less digits than its factorization.

66873537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7430399 (or 7430396 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 66873537 is about 8177.6241659788. The cubic root of 66873537 is about 405.8991090195.

The spelling of 66873537 in words is "sixty-six million, eight hundred seventy-three thousand, five hundred thirty-seven".