127561481181 has 48 divisors (see below), whose sum is σ = 192746089536. Its totient is φ = 84302539776.

The previous prime is 127561481143. The next prime is 127561481209. The reversal of 127561481181 is 181184165721.

It is a happy number.

127561481181 is a `hidden beast` number, since 1 + 2 + 7 + 561 + 4 + 8 + 1 + 1 + 81 = 666.

It is not a de Polignac number, because 127561481181 - 2²³ = 127553092573 is a prime.

It is a super-2 number, since 2×127561481181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127561481111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13736766 + ... + 13746048.

It is an arithmetic number, because the mean of its divisors is an integer number (4015543532).

Almost surely, 2^127561481181 is an apocalyptic number.

It is an amenable number.

127561481181 is a deficient number, since it is larger than the sum of its proper divisors (65184608355).

127561481181 is an equidigital number, since it uses as much as digits as its factorization.

127561481181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9784 (or 9772 counting only the distinct ones).

The product of its digits is 107520, while the sum is 45.

The spelling of 127561481181 in words is "one hundred twenty-seven billion, five hundred sixty-one million, four hundred eighty-one thousand, one hundred eighty-one".