265135603861 has 2 divisors, whose sum is σ = 265135603862. Its totient is φ = 265135603860.

The previous prime is 265135603853. The next prime is 265135603891. The reversal of 265135603861 is 168306531562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 265127159025 + 8444836 = 514905^2 + 2906^2 .

It is a cyclic number.

It is not a de Polignac number, because 265135603861 - 2³ = 265135603853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265135603891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132567801930 + 132567801931.

It is an arithmetic number, because the mean of its divisors is an integer number (132567801931).

Almost surely, 2^265135603861 is an apocalyptic number.

It is an amenable number.

265135603861 is a deficient number, since it is larger than the sum of its proper divisors (1).

265135603861 is an equidigital number, since it uses as much as digits as its factorization.

265135603861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 46.

The spelling of 265135603861 in words is "two hundred sixty-five billion, one hundred thirty-five million, six hundred three thousand, eight hundred sixty-one".