2661305313 has 4 divisors (see below), whose sum is σ = 3548407088. Its totient is φ = 1774203540.

The previous prime is 2661305293. The next prime is 2661305333. The reversal of 2661305313 is 3135031662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2661305293) and next prime (2661305333).

It is not a de Polignac number, because 2661305313 - 2²⁰ = 2660256737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661305333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443550883 + ... + 443550888.

It is an arithmetic number, because the mean of its divisors is an integer number (887101772).

Almost surely, 2^2661305313 is an apocalyptic number.

It is an amenable number.

2661305313 is a deficient number, since it is larger than the sum of its proper divisors (887101775).

2661305313 is an equidigital number, since it uses as much as digits as its factorization.

2661305313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887101774.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 2661305313 is about 51587.8407476025. The cubic root of 2661305313 is about 1385.7925864378.

Adding to 2661305313 its reverse (3135031662), we get a palindrome (5796336975).

The spelling of 2661305313 in words is "two billion, six hundred sixty-one million, three hundred five thousand, three hundred thirteen".