55551055561 has 4 divisors (see below), whose sum is σ = 55567676032. Its totient is φ = 55534435092.

The previous prime is 55551055541. The next prime is 55551055577. The reversal of 55551055561 is 16555015555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55551055561 - 2²³ = 55542666953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55551055541) 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, 8305221 + ... + 8311906.

It is an arithmetic number, because the mean of its divisors is an integer number (13891919008).

Almost surely, 2^55551055561 is an apocalyptic number.

It is an amenable number.

55551055561 is a deficient number, since it is larger than the sum of its proper divisors (16620471).

55551055561 is a wasteful number, since it uses less digits than its factorization.

55551055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16620470.

The product of its (nonzero) digits is 468750, while the sum is 43.

The spelling of 55551055561 in words is "fifty-five billion, five hundred fifty-one million, fifty-five thousand, five hundred sixty-one".