5661511013 has 4 divisors (see below), whose sum is σ = 5663982348. Its totient is φ = 5659039680.

The previous prime is 5661510991. The next prime is 5661511043. The reversal of 5661511013 is 3101151665.

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 2777606209 + 2883904804 = 52703^2 + 53702^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661511013 - 2²⁸ = 5393075557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5661511043) 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, 1232228 + ... + 1236813.

It is an arithmetic number, because the mean of its divisors is an integer number (1415995587).

Almost surely, 2^5661511013 is an apocalyptic number.

It is an amenable number.

5661511013 is a deficient number, since it is larger than the sum of its proper divisors (2471335).

5661511013 is a wasteful number, since it uses less digits than its factorization.

5661511013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2471334.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 5661511013 is about 75243.0130510468. The cubic root of 5661511013 is about 1782.2862317092.

Adding to 5661511013 its reverse (3101151665), we get a palindrome (8762662678).

The spelling of 5661511013 in words is "five billion, six hundred sixty-one million, five hundred eleven thousand, thirteen".