500055561 has 12 divisors (see below), whose sum is σ = 764791092. Its totient is φ = 313760256.

The previous prime is 500055559. The next prime is 500055571. The reversal of 500055561 is 165550005.

500055561 is a `hidden beast` number, since 50 + 0 + 0 + 55 + 561 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 148718025 + 351337536 = 12195^2 + 18744^2 .

It is not a de Polignac number, because 500055561 - 2¹ = 500055559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (500055571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1634016 + ... + 1634321.

It is an arithmetic number, because the mean of its divisors is an integer number (63732591).

Almost surely, 2^500055561 is an apocalyptic number.

500055561 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

500055561 is a deficient number, since it is larger than the sum of its proper divisors (264735531).

500055561 is a wasteful number, since it uses less digits than its factorization.

500055561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268360 (or 3268357 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 500055561 is about 22361.9221222148. The cubic root of 500055561 is about 793.7299240918.

The spelling of 500055561 in words is "five hundred million, fifty-five thousand, five hundred sixty-one".