66886637 has 4 divisors (see below), whose sum is σ = 66912540. Its totient is φ = 66860736.

The previous prime is 66886627. The next prime is 66886643. The reversal of 66886637 is 73668866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56460196 + 10426441 = 7514^2 + 3229^2 .

It is a cyclic number.

It is not a de Polignac number, because 66886637 - 2¹⁰ = 66885613 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 (66886607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8588 + ... + 14405.

It is an arithmetic number, because the mean of its divisors is an integer number (16728135).

Almost surely, 2^66886637 is an apocalyptic number.

It is an amenable number.

66886637 is a deficient number, since it is larger than the sum of its proper divisors (25903).

66886637 is a wasteful number, since it uses less digits than its factorization.

66886637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25902.

The product of its digits is 1741824, while the sum is 50.

The square root of 66886637 is about 8178.4250928892. The cubic root of 66886637 is about 405.9256114369.

The spelling of 66886637 in words is "sixty-six million, eight hundred eighty-six thousand, six hundred thirty-seven".