266081887 has 2 divisors, whose sum is σ = 266081888. Its totient is φ = 266081886.

The previous prime is 266081863. The next prime is 266081927. The reversal of 266081887 is 788180662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266081887 - 2¹⁹ = 265557599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266088887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133040943 + 133040944.

It is an arithmetic number, because the mean of its divisors is an integer number (133040944).

Almost surely, 2^266081887 is an apocalyptic number.

266081887 is a deficient number, since it is larger than the sum of its proper divisors (1).

266081887 is an equidigital number, since it uses as much as digits as its factorization.

266081887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 266081887 is about 16312.0166441798. The cubic root of 266081887 is about 643.1887465944.

The spelling of 266081887 in words is "two hundred sixty-six million, eighty-one thousand, eight hundred eighty-seven".