265857997963 has 2 divisors, whose sum is σ = 265857997964. Its totient is φ = 265857997962.

The previous prime is 265857997931. The next prime is 265857998011. The reversal of 265857997963 is 369799758562.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 265857997963 - 2⁵ = 265857997931 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265857997963.

It is not a weakly prime, because it can be changed into another prime (265857997463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132928998981 + 132928998982.

It is an arithmetic number, because the mean of its divisors is an integer number (132928998982).

Almost surely, 2^265857997963 is an apocalyptic number.

265857997963 is a deficient number, since it is larger than the sum of its proper divisors (1).

265857997963 is an equidigital number, since it uses as much as digits as its factorization.

265857997963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1543147200, while the sum is 76.

The spelling of 265857997963 in words is "two hundred sixty-five billion, eight hundred fifty-seven million, nine hundred ninety-seven thousand, nine hundred sixty-three".