126708757181 has 4 divisors (see below), whose sum is σ = 131078024700. Its totient is φ = 122339489664.

The previous prime is 126708757157. The next prime is 126708757187. The reversal of 126708757181 is 181757807621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 181757807621 = 13 ⋅13981369817.

It can be written as a sum of positive squares in 2 ways, for example, as 100669771225 + 26038985956 = 317285^2 + 161366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126708757181 is a prime.

It is a super-2 number, since 2×126708757181² (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 (126708757187) by changing a digit.

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, 2184633716 + ... + 2184633773.

It is an arithmetic number, because the mean of its divisors is an integer number (32769506175).

Almost surely, 2^126708757181 is an apocalyptic number.

It is an amenable number.

126708757181 is a deficient number, since it is larger than the sum of its proper divisors (4369267519).

126708757181 is an equidigital number, since it uses as much as digits as its factorization.

126708757181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4369267518.

The product of its (nonzero) digits is 1317120, while the sum is 53.

The spelling of 126708757181 in words is "one hundred twenty-six billion, seven hundred eight million, seven hundred fifty-seven thousand, one hundred eighty-one".