138637778071 has 4 divisors (see below), whose sum is σ = 149302222552. Its totient is φ = 127973333592.

The previous prime is 138637778053. The next prime is 138637778101. The reversal of 138637778071 is 170877736831.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 138637778071 - 2⁹ = 138637777559 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138637777997 and 138637778015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138637778051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5332222221 + ... + 5332222246.

It is an arithmetic number, because the mean of its divisors is an integer number (37325555638).

Almost surely, 2^138637778071 is an apocalyptic number.

138637778071 is a deficient number, since it is larger than the sum of its proper divisors (10664444481).

138637778071 is a wasteful number, since it uses less digits than its factorization.

138637778071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10664444480.

The product of its (nonzero) digits is 8297856, while the sum is 58.

The spelling of 138637778071 in words is "one hundred thirty-eight billion, six hundred thirty-seven million, seven hundred seventy-eight thousand, seventy-one".