265541601564 has 24 divisors (see below), whose sum is σ = 688441189520. Its totient is φ = 88513867152.

The previous prime is 265541601551. The next prime is 265541601571. The reversal of 265541601564 is 465106145562.

265541601564 is a `hidden beast` number, since 26 + 5 + 5 + 4 + 1 + 60 + 1 + 564 = 666.

265541601564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×265541601564² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1229359159 + ... + 1229359374.

Almost surely, 2^265541601564 is an apocalyptic number.

It is an amenable number.

265541601564 is an abundant number, since it is smaller than the sum of its proper divisors (422899587956).

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

265541601564 is a wasteful number, since it uses less digits than its factorization.

265541601564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2458718546 (or 2458718538 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 265541601564 in words is "two hundred sixty-five billion, five hundred forty-one million, six hundred one thousand, five hundred sixty-four".