127695449781 has 8 divisors (see below), whose sum is σ = 189178444160. Its totient is φ = 85130299836.

The previous prime is 127695449773. The next prime is 127695449813. The reversal of 127695449781 is 187944596721.

127695449781 is a `hidden beast` number, since 1 + 2 + 7 + 6 + 9 + 544 + 9 + 7 + 81 = 666.

It is not a de Polignac number, because 127695449781 - 2³ = 127695449773 is a prime.

It is a super-2 number, since 2×127695449781² (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 (127695449711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2364730525 + ... + 2364730578.

It is an arithmetic number, because the mean of its divisors is an integer number (23647305520).

Almost surely, 2^127695449781 is an apocalyptic number.

It is an amenable number.

127695449781 is a deficient number, since it is larger than the sum of its proper divisors (61482994379).

127695449781 is an equidigital number, since it uses as much as digits as its factorization.

127695449781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4729461112 (or 4729461106 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 63.

The spelling of 127695449781 in words is "one hundred twenty-seven billion, six hundred ninety-five million, four hundred forty-nine thousand, seven hundred eighty-one".