126590440142521 has 2 divisors, whose sum is σ = 126590440142522. Its totient is φ = 126590440142520.

The previous prime is 126590440142503. The next prime is 126590440142549. The reversal of 126590440142521 is 125241044095621.

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., 111586158999225 + 15004281143296 = 10563435^2 + 3873536^2 .

It is a cyclic number.

It is not a de Polignac number, because 126590440142521 - 2²¹ = 126590438045369 is a prime.

It is not a weakly prime, because it can be changed into another prime (126590440142561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63295220071260 + 63295220071261.

It is an arithmetic number, because the mean of its divisors is an integer number (63295220071261).

Almost surely, 2^{126590440142521} is an apocalyptic number.

It is an amenable number.

126590440142521 is a deficient number, since it is larger than the sum of its proper divisors (1).

126590440142521 is an equidigital number, since it uses as much as digits as its factorization.

126590440142521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 126590440142521 in words is "one hundred twenty-six trillion, five hundred ninety billion, four hundred forty million, one hundred forty-two thousand, five hundred twenty-one".