138668616878 has 16 divisors (see below), whose sum is σ = 227024854704. Its totient is φ = 62999919360.

The previous prime is 138668616851. The next prime is 138668616941. The reversal of 138668616878 is 878616866831.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1518125 + ... + 1606872.

It is an arithmetic number, because the mean of its divisors is an integer number (14189053419).

Almost surely, 2^138668616878 is an apocalyptic number.

138668616878 is a deficient number, since it is larger than the sum of its proper divisors (88356237826).

138668616878 is a wasteful number, since it uses less digits than its factorization.

138668616878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127027.

The product of its digits is 111476736, while the sum is 68.

The spelling of 138668616878 in words is "one hundred thirty-eight billion, six hundred sixty-eight million, six hundred sixteen thousand, eight hundred seventy-eight".