266525621 has 2 divisors, whose sum is σ = 266525622. Its totient is φ = 266525620.

The previous prime is 266525617. The next prime is 266525627. The reversal of 266525621 is 126525662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250082596 + 16443025 = 15814^2 + 4055^2 .

It is a cyclic number.

It is not a de Polignac number, because 266525621 - 2² = 266525617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266525627) 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, 133262810 + 133262811.

It is an arithmetic number, because the mean of its divisors is an integer number (133262811).

Almost surely, 2^266525621 is an apocalyptic number.

It is an amenable number.

266525621 is a deficient number, since it is larger than the sum of its proper divisors (1).

266525621 is an equidigital number, since it uses as much as digits as its factorization.

266525621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43200, while the sum is 35.

The square root of 266525621 is about 16325.6124234284. The cubic root of 266525621 is about 643.5460879786.

The spelling of 266525621 in words is "two hundred sixty-six million, five hundred twenty-five thousand, six hundred twenty-one".