6668505138 has 32 divisors (see below), whose sum is σ = 13927044096. Its totient is φ = 2124637328.

The previous prime is 6668505133. The next prime is 6668505167. The reversal of 6668505138 is 8315058666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6668505133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179995 + ... + 213857.

It is an arithmetic number, because the mean of its divisors is an integer number (435220128).

Almost surely, 2^6668505138 is an apocalyptic number.

6668505138 is an abundant number, since it is smaller than the sum of its proper divisors (7258538958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6668505138 is a wasteful number, since it uses less digits than its factorization.

6668505138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35318.

The product of its (nonzero) digits is 1036800, while the sum is 48.

The square root of 6668505138 is about 81660.9156083864. The cubic root of 6668505138 is about 1882.2450486374.

The spelling of 6668505138 in words is "six billion, six hundred sixty-eight million, five hundred five thousand, one hundred thirty-eight".