266374621 has 2 divisors, whose sum is σ = 266374622. Its totient is φ = 266374620.

The previous prime is 266374613. The next prime is 266374627. The reversal of 266374621 is 126473662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237591396 + 28783225 = 15414^2 + 5365^2 .

It is a cyclic number.

It is not a de Polignac number, because 266374621 - 2³ = 266374613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266374627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133187310 + 133187311.

It is an arithmetic number, because the mean of its divisors is an integer number (133187311).

Almost surely, 2^266374621 is an apocalyptic number.

It is an amenable number.

266374621 is a deficient number, since it is larger than the sum of its proper divisors (1).

266374621 is an equidigital number, since it uses as much as digits as its factorization.

266374621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 37.

The square root of 266374621 is about 16320.9871331363. The cubic root of 266374621 is about 643.4245314140.

It can be divided in two parts, 2663 and 74621, that added together give a square (77284 = 278²).

The spelling of 266374621 in words is "two hundred sixty-six million, three hundred seventy-four thousand, six hundred twenty-one".