2661133513 has 4 divisors (see below), whose sum is σ = 2661879808. Its totient is φ = 2660387220.

The previous prime is 2661133507. The next prime is 2661133523. The reversal of 2661133513 is 3153311662.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3153311662 = 2 ⋅1576655831.

It is a cyclic number.

It is not a de Polignac number, because 2661133513 - 2⁵ = 2661133481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661133523) 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, 367773 + ... + 374938.

It is an arithmetic number, because the mean of its divisors is an integer number (665469952).

Almost surely, 2^2661133513 is an apocalyptic number.

It is an amenable number.

2661133513 is a deficient number, since it is larger than the sum of its proper divisors (746295).

2661133513 is an equidigital number, since it uses as much as digits as its factorization.

2661133513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746294.

The product of its digits is 9720, while the sum is 31.

The square root of 2661133513 is about 51586.1755996701. The cubic root of 2661133513 is about 1385.7627659473.

The spelling of 2661133513 in words is "two billion, six hundred sixty-one million, one hundred thirty-three thousand, five hundred thirteen".