138540646786 has 16 divisors (see below), whose sum is σ = 216869788800. Its totient is φ = 66251371648.

The previous prime is 138540646757. The next prime is 138540646817. The reversal of 138540646786 is 687646045831.

It is a self number, because there is not a number n which added to its sum of digits gives 138540646786.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277170 + ... + 594898.

It is an arithmetic number, because the mean of its divisors is an integer number (13554361800).

Almost surely, 2^138540646786 is an apocalyptic number.

138540646786 is a deficient number, since it is larger than the sum of its proper divisors (78329142014).

138540646786 is a wasteful number, since it uses less digits than its factorization.

138540646786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327233.

The product of its (nonzero) digits is 23224320, while the sum is 58.

The spelling of 138540646786 in words is "one hundred thirty-eight billion, five hundred forty million, six hundred forty-six thousand, seven hundred eighty-six".