2661012265 has 4 divisors (see below), whose sum is σ = 3193214724. Its totient is φ = 2128809808.

The previous prime is 2661012223. The next prime is 2661012271. The reversal of 2661012265 is 5622101662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1288235664 + 1372776601 = 35892^2 + 37051^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661012265 - 2¹⁷ = 2660881193 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266101222 + ... + 266101231.

It is an arithmetic number, because the mean of its divisors is an integer number (798303681).

Almost surely, 2^2661012265 is an apocalyptic number.

It is an amenable number.

2661012265 is a deficient number, since it is larger than the sum of its proper divisors (532202459).

2661012265 is an equidigital number, since it uses as much as digits as its factorization.

2661012265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532202458.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2661012265 is about 51585.0003877096. Note that the first 3 decimals coincide. The cubic root of 2661012265 is about 1385.7417193375.

The spelling of 2661012265 in words is "two billion, six hundred sixty-one million, twelve thousand, two hundred sixty-five".