266378280827 has 2 divisors, whose sum is σ = 266378280828. Its totient is φ = 266378280826.

The previous prime is 266378280769. The next prime is 266378280923. The reversal of 266378280827 is 728082873662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266378280827 - 2¹⁴ = 266378264443 is a prime.

It is not a weakly prime, because it can be changed into another prime (266378280527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133189140413 + 133189140414.

It is an arithmetic number, because the mean of its divisors is an integer number (133189140414).

Almost surely, 2^266378280827 is an apocalyptic number.

266378280827 is a deficient number, since it is larger than the sum of its proper divisors (1).

266378280827 is an equidigital number, since it uses as much as digits as its factorization.

266378280827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21676032, while the sum is 59.

The spelling of 266378280827 in words is "two hundred sixty-six billion, three hundred seventy-eight million, two hundred eighty thousand, eight hundred twenty-seven".