2261665520 has 40 divisors (see below), whose sum is σ = 5260518960. Its totient is φ = 904296960.

The previous prime is 2261665519. The next prime is 2261665529. The reversal of 2261665520 is 255661622.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2261665529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278315 + ... + 286325.

It is an arithmetic number, because the mean of its divisors is an integer number (131512974).

Almost surely, 2^2261665520 is an apocalyptic number.

2261665520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2261665520 is an abundant number, since it is smaller than the sum of its proper divisors (2998853440).

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

2261665520 is a wasteful number, since it uses less digits than its factorization.

2261665520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11553 (or 11547 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 2261665520 is about 47556.9713081058. The cubic root of 2261665520 is about 1312.6314102136.

The spelling of 2261665520 in words is "two billion, two hundred sixty-one million, six hundred sixty-five thousand, five hundred twenty".