126161783257 has 2 divisors, whose sum is σ = 126161783258. Its totient is φ = 126161783256.

The previous prime is 126161783249. The next prime is 126161783333. The reversal of 126161783257 is 752387161621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102756149136 + 23405634121 = 320556^2 + 152989^2 .

It is a cyclic number.

It is not a de Polignac number, because 126161783257 - 2³ = 126161783249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126161783257.

It is not a weakly prime, because it can be changed into another prime (126161783057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63080891628 + 63080891629.

It is an arithmetic number, because the mean of its divisors is an integer number (63080891629).

Almost surely, 2^126161783257 is an apocalyptic number.

It is an amenable number.

126161783257 is a deficient number, since it is larger than the sum of its proper divisors (1).

126161783257 is an equidigital number, since it uses as much as digits as its factorization.

126161783257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 846720, while the sum is 49.

The spelling of 126161783257 in words is "one hundred twenty-six billion, one hundred sixty-one million, seven hundred eighty-three thousand, two hundred fifty-seven".