126181992689 has 2 divisors, whose sum is σ = 126181992690. Its totient is φ = 126181992688.

The previous prime is 126181992683. The next prime is 126181992719. The reversal of 126181992689 is 986299181621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77511014464 + 48670978225 = 278408^2 + 220615^2 .

It is a cyclic number.

It is not a de Polignac number, because 126181992689 - 2¹⁶ = 126181927153 is a prime.

It is a super-3 number, since 3×126181992689³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (126181992683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63090996344 + 63090996345.

It is an arithmetic number, because the mean of its divisors is an integer number (63090996345).

Almost surely, 2^126181992689 is an apocalyptic number.

It is an amenable number.

126181992689 is a deficient number, since it is larger than the sum of its proper divisors (1).

126181992689 is an equidigital number, since it uses as much as digits as its factorization.

126181992689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6718464, while the sum is 62.

The spelling of 126181992689 in words is "one hundred twenty-six billion, one hundred eighty-one million, nine hundred ninety-two thousand, six hundred eighty-nine".