55561111001 has 16 divisors (see below), whose sum is σ = 61210183680. Its totient is φ = 50013290880.

The previous prime is 55561110973. The next prime is 55561111003. The reversal of 55561111001 is 10011116555.

It is not a de Polignac number, because 55561111001 - 2³⁰ = 54487369177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55561111003) 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, 672005 + ... + 750141.

It is an arithmetic number, because the mean of its divisors is an integer number (3825636480).

Almost surely, 2^55561111001 is an apocalyptic number.

It is an amenable number.

55561111001 is a deficient number, since it is larger than the sum of its proper divisors (5649072679).

55561111001 is a wasteful number, since it uses less digits than its factorization.

55561111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78784.

The product of its (nonzero) digits is 750, while the sum is 26.

Adding to 55561111001 its reverse (10011116555), we get a palindrome (65572227556).

The spelling of 55561111001 in words is "fifty-five billion, five hundred sixty-one million, one hundred eleven thousand, one".