5515625561 has 16 divisors (see below), whose sum is σ = 5890492800. Its totient is φ = 5153161728.

The previous prime is 5515625519. The next prime is 5515625587. The reversal of 5515625561 is 1655265155.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 5515625561 - 2⁶ = 5515625497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5515625161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 200105 + ... + 225993.

It is an arithmetic number, because the mean of its divisors is an integer number (368155800).

Almost surely, 2^5515625561 is an apocalyptic number.

It is an amenable number.

5515625561 is a deficient number, since it is larger than the sum of its proper divisors (374867239).

5515625561 is a wasteful number, since it uses less digits than its factorization.

5515625561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26128.

The product of its digits is 225000, while the sum is 41.

The square root of 5515625561 is about 74267.2576644648. The cubic root of 5515625561 is about 1766.8442135830.

The spelling of 5515625561 in words is "five billion, five hundred fifteen million, six hundred twenty-five thousand, five hundred sixty-one".