138625942541 has 6 divisors (see below), whose sum is σ = 146306050542. Its totient is φ = 131329839960.

The previous prime is 138625942489. The next prime is 138625942549. The reversal of 138625942541 is 145249526831.

It can be written as a sum of positive squares in only one way, i.e., 73717680100 + 64908262441 = 271510^2 + 254771^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138625942541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138625942541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138625942549) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 192002330 + ... + 192003051.

It is an arithmetic number, because the mean of its divisors is an integer number (24384341757).

Almost surely, 2^138625942541 is an apocalyptic number.

It is an amenable number.

138625942541 is a deficient number, since it is larger than the sum of its proper divisors (7680108001).

138625942541 is an equidigital number, since it uses as much as digits as its factorization.

138625942541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384005419 (or 384005400 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 50.

The spelling of 138625942541 in words is "one hundred thirty-eight billion, six hundred twenty-five million, nine hundred forty-two thousand, five hundred forty-one".