66436885 has 4 divisors (see below), whose sum is σ = 79724268. Its totient is φ = 53149504.

The previous prime is 66436861. The next prime is 66436907. The reversal of 66436885 is 58863466.

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 6853924 + 59582961 = 2618^2 + 7719^2 .

It is a cyclic number.

It is not a de Polignac number, because 66436885 - 2⁹ = 66436373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6643684 + ... + 6643693.

It is an arithmetic number, because the mean of its divisors is an integer number (19931067).

Almost surely, 2^66436885 is an apocalyptic number.

It is an amenable number.

66436885 is a deficient number, since it is larger than the sum of its proper divisors (13287383).

66436885 is a wasteful number, since it uses less digits than its factorization.

66436885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13287382.

The product of its digits is 829440, while the sum is 46.

The square root of 66436885 is about 8150.8824675614. The cubic root of 66436885 is about 405.0137372773.

The spelling of 66436885 in words is "sixty-six million, four hundred thirty-six thousand, eight hundred eighty-five".