55638409181 has 4 divisors (see below), whose sum is σ = 55920837852. Its totient is φ = 55355980512.

The previous prime is 55638409171. The next prime is 55638409201. The reversal of 55638409181 is 18190483655.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43301864281 + 12336544900 = 208091^2 + 111070^2 .

It is a cyclic number.

It is not a de Polignac number, because 55638409181 - 2²² = 55634214877 is a prime.

It is a super-2 number, since 2×55638409181² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55638409171) 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, 141214040 + ... + 141214433.

It is an arithmetic number, because the mean of its divisors is an integer number (13980209463).

Almost surely, 2^55638409181 is an apocalyptic number.

It is an amenable number.

55638409181 is a deficient number, since it is larger than the sum of its proper divisors (282428671).

55638409181 is a wasteful number, since it uses less digits than its factorization.

55638409181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282428670.

The product of its (nonzero) digits is 1036800, while the sum is 50.

The spelling of 55638409181 in words is "fifty-five billion, six hundred thirty-eight million, four hundred nine thousand, one hundred eighty-one".