55561100001 has 16 divisors (see below), whose sum is σ = 81616310208. Its totient is φ = 33339992000.

The previous prime is 55561099991. The next prime is 55561100011. The reversal of 55561100001 is 10000116555.

It is an interprime number because it is at equal distance from previous prime (55561099991) and next prime (55561100011).

It is a cyclic number.

It is not a de Polignac number, because 55561100001 - 2⁷ = 55561099873 is a prime.

It is a super-2 number, since 2×55561100001² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55561100011) 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, 8331666 + ... + 8338331.

It is an arithmetic number, because the mean of its divisors is an integer number (5101019388).

Almost surely, 2^55561100001 is an apocalyptic number.

It is an amenable number.

55561100001 is a deficient number, since it is larger than the sum of its proper divisors (26055210207).

55561100001 is a wasteful number, since it uses less digits than its factorization.

55561100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16670112.

The product of its (nonzero) digits is 750, while the sum is 24.

Adding to 55561100001 its reverse (10000116555), we get a palindrome (65561216556).

The spelling of 55561100001 in words is "fifty-five billion, five hundred sixty-one million, one hundred thousand, one".