265165040 has 80 divisors (see below), whose sum is σ = 721828800. Its totient is φ = 88688640.

The previous prime is 265165039. The next prime is 265165073. The reversal of 265165040 is 40561562.

It is a tau number, because it is divible by the number of its divisors (80).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 265164994 and 265165012.

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, 17186 + ... + 28734.

It is an arithmetic number, because the mean of its divisors is an integer number (9022860).

Almost surely, 2^265165040 is an apocalyptic number.

265165040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 265165040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (360914400).

265165040 is an abundant number, since it is smaller than the sum of its proper divisors (456663760).

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

265165040 is a wasteful number, since it uses less digits than its factorization.

265165040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11610 (or 11604 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 265165040 is about 16283.8889703903. Note that the first 3 decimals coincide. The cubic root of 265165040 is about 642.4491443343.

The spelling of 265165040 in words is "two hundred sixty-five million, one hundred sixty-five thousand, forty".