138777512789 has 4 divisors (see below), whose sum is σ = 138965304480. Its totient is φ = 138589721100.

The previous prime is 138777512777. The next prime is 138777512813. The reversal of 138777512789 is 987215777831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138777512789 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 (138777512749) 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, 93894737 + ... + 93896214.

It is an arithmetic number, because the mean of its divisors is an integer number (34741326120).

Almost surely, 2^138777512789 is an apocalyptic number.

It is an amenable number.

138777512789 is a deficient number, since it is larger than the sum of its proper divisors (187791691).

138777512789 is an equidigital number, since it uses as much as digits as its factorization.

138777512789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187791690.

The product of its digits is 41489280, while the sum is 65.

The spelling of 138777512789 in words is "one hundred thirty-eight billion, seven hundred seventy-seven million, five hundred twelve thousand, seven hundred eighty-nine".