126805272457 has 2 divisors, whose sum is σ = 126805272458. Its totient is φ = 126805272456.

The previous prime is 126805272437. The next prime is 126805272497. The reversal of 126805272457 is 754272508621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121226526976 + 5578745481 = 348176^2 + 74691^2 .

It is a cyclic number.

It is not a de Polignac number, because 126805272457 - 2¹¹ = 126805270409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126805272457.

It is not a weakly prime, because it can be changed into another prime (126805272427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63402636228 + 63402636229.

It is an arithmetic number, because the mean of its divisors is an integer number (63402636229).

Almost surely, 2^126805272457 is an apocalyptic number.

It is an amenable number.

126805272457 is a deficient number, since it is larger than the sum of its proper divisors (1).

126805272457 is an equidigital number, since it uses as much as digits as its factorization.

126805272457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1881600, while the sum is 49.

The spelling of 126805272457 in words is "one hundred twenty-six billion, eight hundred five million, two hundred seventy-two thousand, four hundred fifty-seven".