66667568913 has 16 divisors (see below), whose sum is σ = 107745566400. Its totient is φ = 40404587040.

The previous prime is 66667568899. The next prime is 66667568921. The reversal of 66667568913 is 31986576666.

It is a happy number.

It is not a de Polignac number, because 66667568913 - 2²⁵ = 66634014481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66667568963) 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 15 ways as a sum of consecutive naturals, for example, 112234668 + ... + 112235261.

It is an arithmetic number, because the mean of its divisors is an integer number (6734097900).

Almost surely, 2^66667568913 is an apocalyptic number.

It is an amenable number.

66667568913 is a deficient number, since it is larger than the sum of its proper divisors (41077997487).

66667568913 is a wasteful number, since it uses less digits than its factorization.

66667568913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224469949 (or 224469943 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The spelling of 66667568913 in words is "sixty-six billion, six hundred sixty-seven million, five hundred sixty-eight thousand, nine hundred thirteen".