66044637 has 6 divisors (see below), whose sum is σ = 95397822. Its totient is φ = 44029752.

The previous prime is 66044617. The next prime is 66044651. The reversal of 66044637 is 73644066.

66044637 is a `hidden beast` number, since 6 + 604 + 46 + 3 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 33108516 + 32936121 = 5754^2 + 5739^2 .

It is not a de Polignac number, because 66044637 - 2⁷ = 66044509 is a prime.

It is a super-3 number, since 3×66044637³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66044617) 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, 3669138 + ... + 3669155.

It is an arithmetic number, because the mean of its divisors is an integer number (15899637).

Almost surely, 2^66044637 is an apocalyptic number.

It is an amenable number.

66044637 is a deficient number, since it is larger than the sum of its proper divisors (29353185).

66044637 is a wasteful number, since it uses less digits than its factorization.

66044637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7338299 (or 7338296 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 36.

The square root of 66044637 is about 8126.7851577361. The cubic root of 66044637 is about 404.2150870013.

The spelling of 66044637 in words is "sixty-six million, forty-four thousand, six hundred thirty-seven".