126889506917 has 2 divisors, whose sum is σ = 126889506918. Its totient is φ = 126889506916.

The previous prime is 126889506893. The next prime is 126889506929. The reversal of 126889506917 is 719605988621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102022109281 + 24867397636 = 319409^2 + 157694^2 .

It is a cyclic number.

It is not a de Polignac number, because 126889506917 - 2⁶ = 126889506853 is a prime.

It is a super-2 number, since 2×126889506917² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126889506917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126889508917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63444753458 + 63444753459.

It is an arithmetic number, because the mean of its divisors is an integer number (63444753459).

Almost surely, 2^126889506917 is an apocalyptic number.

It is an amenable number.

126889506917 is a deficient number, since it is larger than the sum of its proper divisors (1).

126889506917 is an equidigital number, since it uses as much as digits as its factorization.

126889506917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 62.

The spelling of 126889506917 in words is "one hundred twenty-six billion, eight hundred eighty-nine million, five hundred six thousand, nine hundred seventeen".