265666099 has 2 divisors, whose sum is σ = 265666100. Its totient is φ = 265666098.

The previous prime is 265666097. The next prime is 265666117. The reversal of 265666099 is 990666562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265666099 - 2¹ = 265666097 is a prime.

Together with 265666097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (265666097) 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, 132833049 + 132833050.

It is an arithmetic number, because the mean of its divisors is an integer number (132833050).

Almost surely, 2^265666099 is an apocalyptic number.

265666099 is a deficient number, since it is larger than the sum of its proper divisors (1).

265666099 is an equidigital number, since it uses as much as digits as its factorization.

265666099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 265666099 is about 16299.2668240016. The cubic root of 265666099 is about 642.8535495555.

The spelling of 265666099 in words is "two hundred sixty-five million, six hundred sixty-six thousand, ninety-nine".