265805436845 has 16 divisors (see below), whose sum is σ = 344284913280. Its totient is φ = 195839947584.

The previous prime is 265805436833. The next prime is 265805436859. The reversal of 265805436845 is 548634508562.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 265805436845 - 2³⁶ = 197085960109 is a prime.

It is a super-2 number, since 2×265805436845² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4628999 + ... + 4686068.

It is an arithmetic number, because the mean of its divisors is an integer number (21517807080).

Almost surely, 2^265805436845 is an apocalyptic number.

It is an amenable number.

265805436845 is a deficient number, since it is larger than the sum of its proper divisors (78479476435).

265805436845 is a wasteful number, since it uses less digits than its factorization.

265805436845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9315524.

The product of its (nonzero) digits is 27648000, while the sum is 56.

The spelling of 265805436845 in words is "two hundred sixty-five billion, eight hundred five million, four hundred thirty-six thousand, eight hundred forty-five".