55011109897 has 4 divisors (see below), whose sum is σ = 58247057556. Its totient is φ = 51775162240.

The previous prime is 55011109873. The next prime is 55011109919. The reversal of 55011109897 is 79890111055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79890111055 = 5 ⋅15978022211.

It can be written as a sum of positive squares in 2 ways, for example, as 39259855881 + 15751254016 = 198141^2 + 125504^2 .

It is a cyclic number.

It is not a de Polignac number, because 55011109897 - 2²³ = 55002721289 is a prime.

It is a super-2 number, since 2×55011109897² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55011109397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1617973804 + ... + 1617973837.

It is an arithmetic number, because the mean of its divisors is an integer number (14561764389).

Almost surely, 2^55011109897 is an apocalyptic number.

It is an amenable number.

55011109897 is a deficient number, since it is larger than the sum of its proper divisors (3235947659).

55011109897 is a wasteful number, since it uses less digits than its factorization.

55011109897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235947658.

The product of its (nonzero) digits is 113400, while the sum is 46.

The spelling of 55011109897 in words is "fifty-five billion, eleven million, one hundred nine thousand, eight hundred ninety-seven".