126805864513 has 2 divisors, whose sum is σ = 126805864514. Its totient is φ = 126805864512.

The previous prime is 126805864489. The next prime is 126805864553. The reversal of 126805864513 is 315468508621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80342768704 + 46463095809 = 283448^2 + 215553^2 .

It is a cyclic number.

It is not a de Polignac number, because 126805864513 - 2¹⁷ = 126805733441 is a prime.

It is not a weakly prime, because it can be changed into another prime (126805864553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63402932256 + 63402932257.

It is an arithmetic number, because the mean of its divisors is an integer number (63402932257).

Almost surely, 2^126805864513 is an apocalyptic number.

It is an amenable number.

126805864513 is a deficient number, since it is larger than the sum of its proper divisors (1).

126805864513 is an equidigital number, since it uses as much as digits as its factorization.

126805864513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382400, while the sum is 49.

The spelling of 126805864513 in words is "one hundred twenty-six billion, eight hundred five million, eight hundred sixty-four thousand, five hundred thirteen".