5515841561 has 8 divisors (see below), whose sum is σ = 5668439784. Its totient is φ = 5364103680.

The previous prime is 5515841549. The next prime is 5515841581. The reversal of 5515841561 is 1651485155.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 186841561 + 5329000000 = 13669^2 + 73000^2 .

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 5515841561 - 2¹⁰ = 5515840537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5515841581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202076 + ... + 227741.

It is an arithmetic number, because the mean of its divisors is an integer number (708554973).

Almost surely, 2^5515841561 is an apocalyptic number.

It is an amenable number.

5515841561 is a deficient number, since it is larger than the sum of its proper divisors (152598223).

5515841561 is a wasteful number, since it uses less digits than its factorization.

5515841561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430171.

The product of its digits is 120000, while the sum is 41.

The square root of 5515841561 is about 74268.7118576861. The cubic root of 5515841561 is about 1766.8672773536.

The spelling of 5515841561 in words is "five billion, five hundred fifteen million, eight hundred forty-one thousand, five hundred sixty-one".