266012525215421 has 2 divisors, whose sum is σ = 266012525215422. Its totient is φ = 266012525215420.

The previous prime is 266012525215403. The next prime is 266012525215429. The reversal of 266012525215421 is 124512525210662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 256460655043321 + 9551870172100 = 16014389^2 + 3090610^2 .

It is a cyclic number.

It is not a de Polignac number, because 266012525215421 - 2⁶ = 266012525215357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266012525215429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133006262607710 + 133006262607711.

It is an arithmetic number, because the mean of its divisors is an integer number (133006262607711).

Almost surely, 2^{266012525215421} is an apocalyptic number.

It is an amenable number.

266012525215421 is a deficient number, since it is larger than the sum of its proper divisors (1).

266012525215421 is an equidigital number, since it uses as much as digits as its factorization.

266012525215421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576000, while the sum is 44.

The spelling of 266012525215421 in words is "two hundred sixty-six trillion, twelve billion, five hundred twenty-five million, two hundred fifteen thousand, four hundred twenty-one".