5661320513 has 8 divisors (see below), whose sum is σ = 5813456040. Its totient is φ = 5511098880.

The previous prime is 5661320491. The next prime is 5661320551. The reversal of 5661320513 is 3150231665.

It can be written as a sum of positive squares in 4 ways, for example, as 263185729 + 5398134784 = 16223^2 + 73472^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 5661320513 - 2¹² = 5661316417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5661320513.

It is not an unprimeable number, because it can be changed into a prime (5661320573) 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, 472478 + ... + 484311.

It is an arithmetic number, because the mean of its divisors is an integer number (726682005).

Almost surely, 2^5661320513 is an apocalyptic number.

It is an amenable number.

5661320513 is a deficient number, since it is larger than the sum of its proper divisors (152135527).

5661320513 is an equidigital number, since it uses as much as digits as its factorization.

5661320513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956947.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 5661320513 is about 75241.7471421285. The cubic root of 5661320513 is about 1782.2662412076.

The spelling of 5661320513 in words is "five billion, six hundred sixty-one million, three hundred twenty thousand, five hundred thirteen".