266788601 has 2 divisors, whose sum is σ = 266788602. Its totient is φ = 266788600.

The previous prime is 266788583. The next prime is 266788631. The reversal of 266788601 is 106887662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 224850025 + 41938576 = 14995^2 + 6476^2 .

It is a cyclic number.

It is not a de Polignac number, because 266788601 - 2¹⁸ = 266526457 is a prime.

It is not a weakly prime, because it can be changed into another prime (266788631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133394300 + 133394301.

It is an arithmetic number, because the mean of its divisors is an integer number (133394301).

Almost surely, 2^266788601 is an apocalyptic number.

It is an amenable number.

266788601 is a deficient number, since it is larger than the sum of its proper divisors (1).

266788601 is an equidigital number, since it uses as much as digits as its factorization.

266788601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 266788601 is about 16333.6646531022. The cubic root of 266788601 is about 643.7576800416.

The spelling of 266788601 in words is "two hundred sixty-six million, seven hundred eighty-eight thousand, six hundred one".