126734237561 has 2 divisors, whose sum is σ = 126734237562. Its totient is φ = 126734237560.

The previous prime is 126734237549. The next prime is 126734237579. The reversal of 126734237561 is 165732437621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64424592400 + 62309645161 = 253820^2 + 249619^2 .

It is an emirp because it is prime and its reverse (165732437621) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126734237561 is a prime.

It is not a weakly prime, because it can be changed into another prime (126734237501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63367118780 + 63367118781.

It is an arithmetic number, because the mean of its divisors is an integer number (63367118781).

Almost surely, 2^126734237561 is an apocalyptic number.

It is an amenable number.

126734237561 is a deficient number, since it is larger than the sum of its proper divisors (1).

126734237561 is an equidigital number, since it uses as much as digits as its factorization.

126734237561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1270080, while the sum is 47.

The spelling of 126734237561 in words is "one hundred twenty-six billion, seven hundred thirty-four million, two hundred thirty-seven thousand, five hundred sixty-one".