266562421 has 2 divisors, whose sum is σ = 266562422. Its totient is φ = 266562420.

The previous prime is 266562391. The next prime is 266562451. The reversal of 266562421 is 124265662.

It is a balanced prime because it is at equal distance from previous prime (266562391) and next prime (266562451).

It can be written as a sum of positive squares in only one way, i.e., 198499921 + 68062500 = 14089^2 + 8250^2 .

It is a cyclic number.

It is not a de Polignac number, because 266562421 - 2¹³ = 266554229 is a prime.

It is a super-3 number, since 3×266562421³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266562451) 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, 133281210 + 133281211.

It is an arithmetic number, because the mean of its divisors is an integer number (133281211).

Almost surely, 2^266562421 is an apocalyptic number.

It is an amenable number.

266562421 is a deficient number, since it is larger than the sum of its proper divisors (1).

266562421 is an equidigital number, since it uses as much as digits as its factorization.

266562421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 34.

The square root of 266562421 is about 16326.7394479118. The cubic root of 266562421 is about 643.5757054016.

The spelling of 266562421 in words is "two hundred sixty-six million, five hundred sixty-two thousand, four hundred twenty-one".