126620640303121 has 2 divisors, whose sum is σ = 126620640303122. Its totient is φ = 126620640303120.

The previous prime is 126620640303107. The next prime is 126620640303167. The reversal of 126620640303121 is 121303046026621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88954324033600 + 37666316269521 = 9431560^2 + 6137289^2 .

It is a cyclic number.

It is not a de Polignac number, because 126620640303121 - 2¹⁹ = 126620639778833 is a prime.

It is not a weakly prime, because it can be changed into another prime (126620640303181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63310320151560 + 63310320151561.

It is an arithmetic number, because the mean of its divisors is an integer number (63310320151561).

Almost surely, 2^{126620640303121} is an apocalyptic number.

It is an amenable number.

126620640303121 is a deficient number, since it is larger than the sum of its proper divisors (1).

126620640303121 is an equidigital number, since it uses as much as digits as its factorization.

126620640303121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

Adding to 126620640303121 its reverse (121303046026621), we get a palindrome (247923686329742).

The spelling of 126620640303121 in words is "one hundred twenty-six trillion, six hundred twenty billion, six hundred forty million, three hundred three thousand, one hundred twenty-one".