66635288847 has 20 divisors (see below), whose sum is σ = 99741147000. Its totient is φ = 44334473904.

The previous prime is 66635288843. The next prime is 66635288887. The reversal of 66635288847 is 74888253666.

It is not a de Polignac number, because 66635288847 - 2² = 66635288843 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66635288843) 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 19 ways as a sum of consecutive naturals, for example, 783888 + ... + 864725.

It is an arithmetic number, because the mean of its divisors is an integer number (4987057350).

Almost surely, 2^66635288847 is an apocalyptic number.

66635288847 is a deficient number, since it is larger than the sum of its proper divisors (33105858153).

66635288847 is a wasteful number, since it uses less digits than its factorization.

66635288847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1649124 (or 1649115 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 63.

The spelling of 66635288847 in words is "sixty-six billion, six hundred thirty-five million, two hundred eighty-eight thousand, eight hundred forty-seven".