265561740 has 60 divisors (see below), whose sum is σ = 833082096. Its totient is φ = 70816032.

The previous prime is 265561721. The next prime is 265561741. The reversal of 265561740 is 47165562.

It is a happy number.

265561740 is a `hidden beast` number, since 26 + 5 + 561 + 74 + 0 = 666.

265561740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 265561695 and 265561704.

It is not an unprimeable number, because it can be changed into a prime (265561741) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 80344 + ... + 83583.

Almost surely, 2^265561740 is an apocalyptic number.

265561740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

265561740 is an abundant number, since it is smaller than the sum of its proper divisors (567520356).

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

265561740 is a wasteful number, since it uses less digits than its factorization.

265561740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163948 (or 163937 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 265561740 is about 16296.0651692364. The cubic root of 265561740 is about 642.7693632527.

The spelling of 265561740 in words is "two hundred sixty-five million, five hundred sixty-one thousand, seven hundred forty".