55000561 has 16 divisors (see below), whose sum is σ = 68946048. Its totient is φ = 42624000.

The previous prime is 55000553. The next prime is 55000571. The reversal of 55000561 is 16500055.

It is a cyclic number.

It is not a de Polignac number, because 55000561 - 2³ = 55000553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55000571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13011 + ... + 16711.

It is an arithmetic number, because the mean of its divisors is an integer number (4309128).

Almost surely, 2^55000561 is an apocalyptic number.

It is an amenable number.

55000561 is a deficient number, since it is larger than the sum of its proper divisors (13945487).

55000561 is a wasteful number, since it uses less digits than its factorization.

55000561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912.

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 55000561 is about 7416.2363096115. The cubic root of 55000561 is about 380.2965390756.

The spelling of 55000561 in words is "fifty-five million, five hundred sixty-one", and thus it is an aban number.