266601421 has 2 divisors, whose sum is σ = 266601422. Its totient is φ = 266601420.

The previous prime is 266601409. The next prime is 266601451. The reversal of 266601421 is 124106662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154008100 + 112593321 = 12410^2 + 10611^2 .

It is a cyclic number.

It is not a de Polignac number, because 266601421 - 2⁹ = 266600909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 266601421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266601451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133300710 + 133300711.

It is an arithmetic number, because the mean of its divisors is an integer number (133300711).

Almost surely, 2^266601421 is an apocalyptic number.

It is an amenable number.

266601421 is a deficient number, since it is larger than the sum of its proper divisors (1).

266601421 is an equidigital number, since it uses as much as digits as its factorization.

266601421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 266601421 is about 16327.9337639519. The cubic root of 266601421 is about 643.6070904564.

The spelling of 266601421 in words is "two hundred sixty-six million, six hundred one thousand, four hundred twenty-one".