66206637 has 12 divisors (see below), whose sum is σ = 109293600. Its totient is φ = 37832328.

The previous prime is 66206617. The next prime is 66206639. The reversal of 66206637 is 73660266.

It is not a de Polignac number, because 66206637 - 2⁷ = 66206509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 525387 + ... + 525512.

It is an arithmetic number, because the mean of its divisors is an integer number (9107800).

Almost surely, 2^66206637 is an apocalyptic number.

It is an amenable number.

66206637 is a deficient number, since it is larger than the sum of its proper divisors (43086963).

66206637 is a wasteful number, since it uses less digits than its factorization.

66206637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050912 (or 1050909 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 66206637 is about 8136.7460941091. The cubic root of 66206637 is about 404.5453150574.

The spelling of 66206637 in words is "sixty-six million, two hundred six thousand, six hundred thirty-seven".