5815525561 has 4 divisors (see below), whose sum is σ = 5873105124. Its totient is φ = 5757946000.

The previous prime is 5815525549. The next prime is 5815525591. The reversal of 5815525561 is 1655255185.

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 4590875536 + 1224650025 = 67756^2 + 34995^2 .

It is a cyclic number.

It is not a de Polignac number, because 5815525561 - 2¹⁷ = 5815394489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5815525591) 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, 28789630 + ... + 28789831.

It is an arithmetic number, because the mean of its divisors is an integer number (1468276281).

Almost surely, 2^5815525561 is an apocalyptic number.

It is an amenable number.

5815525561 is a deficient number, since it is larger than the sum of its proper divisors (57579563).

5815525561 is a wasteful number, since it uses less digits than its factorization.

5815525561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57579562.

The product of its digits is 300000, while the sum is 43.

The square root of 5815525561 is about 76259.5932391460. The cubic root of 5815525561 is about 1798.3035004202.

The spelling of 5815525561 in words is "five billion, eight hundred fifteen million, five hundred twenty-five thousand, five hundred sixty-one".