127785117869 has 4 divisors (see below), whose sum is σ = 127870938780. Its totient is φ = 127699296960.

The previous prime is 127785117857. The next prime is 127785117871. The reversal of 127785117869 is 968711587721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27526128100 + 100258989769 = 165910^2 + 316637^2 .

It is a cyclic number.

It is not a de Polignac number, because 127785117869 - 2⁸ = 127785117613 is a prime.

It is a super-2 number, since 2×127785117869² (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 (127785117169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42908222 + ... + 42911199.

It is an arithmetic number, because the mean of its divisors is an integer number (31967734695).

Almost surely, 2^127785117869 is an apocalyptic number.

It is an amenable number.

127785117869 is a deficient number, since it is larger than the sum of its proper divisors (85820911).

127785117869 is an equidigital number, since it uses as much as digits as its factorization.

127785117869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85820910.

The product of its digits is 11854080, while the sum is 62.

The spelling of 127785117869 in words is "one hundred twenty-seven billion, seven hundred eighty-five million, one hundred seventeen thousand, eight hundred sixty-nine".