138877621741 has 16 divisors (see below), whose sum is σ = 146784153600. Its totient is φ = 131127570288.

The previous prime is 138877621721. The next prime is 138877621777. The reversal of 138877621741 is 147126778831.

It is a cyclic number.

It is not a de Polignac number, because 138877621741 - 2²¹ = 138875524589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138877621721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13547880 + ... + 13558126.

It is an arithmetic number, because the mean of its divisors is an integer number (9174009600).

Almost surely, 2^138877621741 is an apocalyptic number.

It is an amenable number.

138877621741 is a deficient number, since it is larger than the sum of its proper divisors (7906531859).

138877621741 is a wasteful number, since it uses less digits than its factorization.

138877621741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17808.

The product of its digits is 3161088, while the sum is 55.

The spelling of 138877621741 in words is "one hundred thirty-eight billion, eight hundred seventy-seven million, six hundred twenty-one thousand, seven hundred forty-one".