127918905519 has 4 divisors (see below), whose sum is σ = 170558540696. Its totient is φ = 85279270344.

The previous prime is 127918905469. The next prime is 127918905571. The reversal of 127918905519 is 915509819721.

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

It is not a de Polignac number, because 127918905519 - 2⁷ = 127918905391 is a prime.

It is a super-2 number, since 2×127918905519² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127918905019) 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, 21319817584 + ... + 21319817589.

It is an arithmetic number, because the mean of its divisors is an integer number (42639635174).

Almost surely, 2^127918905519 is an apocalyptic number.

127918905519 is a deficient number, since it is larger than the sum of its proper divisors (42639635177).

127918905519 is an equidigital number, since it uses as much as digits as its factorization.

127918905519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42639635176.

The product of its (nonzero) digits is 2041200, while the sum is 57.

The spelling of 127918905519 in words is "one hundred twenty-seven billion, nine hundred eighteen million, nine hundred five thousand, five hundred nineteen".