266545398389 has 2 divisors, whose sum is σ = 266545398390. Its totient is φ = 266545398388.

The previous prime is 266545398341. The next prime is 266545398461. The reversal of 266545398389 is 983893545662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238087395364 + 28458003025 = 487942^2 + 168695^2 .

It is a cyclic number.

It is not a de Polignac number, because 266545398389 - 2²⁸ = 266276962933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266545398319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133272699194 + 133272699195.

It is an arithmetic number, because the mean of its divisors is an integer number (133272699195).

Almost surely, 2^266545398389 is an apocalyptic number.

It is an amenable number.

266545398389 is a deficient number, since it is larger than the sum of its proper divisors (1).

266545398389 is an equidigital number, since it uses as much as digits as its factorization.

266545398389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 335923200, while the sum is 68.

The spelling of 266545398389 in words is "two hundred sixty-six billion, five hundred forty-five million, three hundred ninety-eight thousand, three hundred eighty-nine".