726412636121 has 2 divisors, whose sum is σ = 726412636122. Its totient is φ = 726412636120.

The previous prime is 726412636063. The next prime is 726412636223. The reversal of 726412636121 is 121636214627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 519028030096 + 207384606025 = 720436^2 + 455395^2 .

It is a cyclic number.

It is not a de Polignac number, because 726412636121 - 2²² = 726408441817 is a prime.

It is not a weakly prime, because it can be changed into another prime (726412636321) 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, 363206318060 + 363206318061.

It is an arithmetic number, because the mean of its divisors is an integer number (363206318061).

Almost surely, 2^726412636121 is an apocalyptic number.

It is an amenable number.

726412636121 is a deficient number, since it is larger than the sum of its proper divisors (1).

726412636121 is an equidigital number, since it uses as much as digits as its factorization.

726412636121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 41.

The spelling of 726412636121 in words is "seven hundred twenty-six billion, four hundred twelve million, six hundred thirty-six thousand, one hundred twenty-one".