138776277515 has 4 divisors (see below), whose sum is σ = 166531533024. Its totient is φ = 111021022008.

The previous prime is 138776277509. The next prime is 138776277583. The reversal of 138776277515 is 515772677831.

138776277515 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515772677831 = 79397 ⋅6496123.

It is a cyclic number.

It is not a de Polignac number, because 138776277515 - 2²² = 138772083211 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13877627747 + ... + 13877627756.

It is an arithmetic number, because the mean of its divisors is an integer number (41632883256).

Almost surely, 2^138776277515 is an apocalyptic number.

138776277515 is a deficient number, since it is larger than the sum of its proper divisors (27755255509).

138776277515 is an equidigital number, since it uses as much as digits as its factorization.

138776277515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27755255508.

The product of its digits is 17287200, while the sum is 59.

The spelling of 138776277515 in words is "one hundred thirty-eight billion, seven hundred seventy-six million, two hundred seventy-seven thousand, five hundred fifteen".