265553320644 has 96 divisors (see below), whose sum is σ = 704896335360. Its totient is φ = 86415538176.

The previous prime is 265553320609. The next prime is 265553320649. The reversal of 265553320644 is 446023355562.

265553320644 is a `hidden beast` number, since 2 + 6 + 5 + 553 + 32 + 0 + 64 + 4 = 666.

265553320644 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 2×265553320644² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 265553320644.

It is not an unprimeable number, because it can be changed into a prime (265553320649) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1949284 + ... + 2081060.

It is an arithmetic number, because the mean of its divisors is an integer number (7342670160).

Almost surely, 2^265553320644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265553320644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (352448167680).

265553320644 is an abundant number, since it is smaller than the sum of its proper divisors (439343014716).

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

265553320644 is a wasteful number, since it uses less digits than its factorization.

265553320644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132234 (or 132226 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 45.

The spelling of 265553320644 in words is "two hundred sixty-five billion, five hundred fifty-three million, three hundred twenty thousand, six hundred forty-four".