265661805045 has 128 divisors (see below), whose sum is σ = 538300514304. Its totient is φ = 108868230144.

The previous prime is 265661805041. The next prime is 265661805053. The reversal of 265661805045 is 540508166562.

It is not a de Polignac number, because 265661805045 - 2² = 265661805041 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 265661804985 and 265661805003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265661805041) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 28429644 + ... + 28438986.

It is an arithmetic number, because the mean of its divisors is an integer number (4205472768).

Almost surely, 2^265661805045 is an apocalyptic number.

It is an amenable number.

265661805045 is an abundant number, since it is smaller than the sum of its proper divisors (272638709259).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265661805045 is a wasteful number, since it uses less digits than its factorization.

265661805045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9971.

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 265661805045 in words is "two hundred sixty-five billion, six hundred sixty-one million, eight hundred five thousand, forty-five".