2661513265 has 8 divisors (see below), whose sum is σ = 3246173928. Its totient is φ = 2094305280.

The previous prime is 2661513263. The next prime is 2661513269. The reversal of 2661513265 is 5623151662.

2661513265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 120143521 + 2541369744 = 10961^2 + 50412^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2661513265 - 2¹ = 2661513263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661513263) 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, 4362832 + ... + 4363441.

It is an arithmetic number, because the mean of its divisors is an integer number (405771741).

Almost surely, 2^2661513265 is an apocalyptic number.

It is an amenable number.

2661513265 is a deficient number, since it is larger than the sum of its proper divisors (584660663).

2661513265 is an equidigital number, since it uses as much as digits as its factorization.

2661513265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8726339.

The product of its digits is 64800, while the sum is 37.

The square root of 2661513265 is about 51589.8562219357. The cubic root of 2661513265 is about 1385.8286803592.

The spelling of 2661513265 in words is "two billion, six hundred sixty-one million, five hundred thirteen thousand, two hundred sixty-five".