126213658889 has 2 divisors, whose sum is σ = 126213658890. Its totient is φ = 126213658888.

The previous prime is 126213658847. The next prime is 126213658979. The reversal of 126213658889 is 988856312621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87774135289 + 38439523600 = 296267^2 + 196060^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126213658889 is a prime.

It is not a weakly prime, because it can be changed into another prime (126213658189) 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 as a sum of consecutive naturals, namely, 63106829444 + 63106829445.

It is an arithmetic number, because the mean of its divisors is an integer number (63106829445).

Almost surely, 2^126213658889 is an apocalyptic number.

It is an amenable number.

126213658889 is a deficient number, since it is larger than the sum of its proper divisors (1).

126213658889 is an equidigital number, since it uses as much as digits as its factorization.

126213658889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9953280, while the sum is 59.

The spelling of 126213658889 in words is "one hundred twenty-six billion, two hundred thirteen million, six hundred fifty-eight thousand, eight hundred eighty-nine".