265679987 has 2 divisors, whose sum is σ = 265679988. Its totient is φ = 265679986.

The previous prime is 265679917. The next prime is 265680001. The reversal of 265679987 is 789976562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265679987 - 2²⁶ = 198571123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (265679917) 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, 132839993 + 132839994.

It is an arithmetic number, because the mean of its divisors is an integer number (132839994).

Almost surely, 2^265679987 is an apocalyptic number.

265679987 is a deficient number, since it is larger than the sum of its proper divisors (1).

265679987 is an equidigital number, since it uses as much as digits as its factorization.

265679987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11430720, while the sum is 59.

The square root of 265679987 is about 16299.6928498668. The cubic root of 265679987 is about 642.8647513291.

The spelling of 265679987 in words is "two hundred sixty-five million, six hundred seventy-nine thousand, nine hundred eighty-seven".