55581621183 has 96 divisors (see below), whose sum is σ = 92464669440. Its totient is φ = 31862315520.

The previous prime is 55581621103. The next prime is 55581621191. The reversal of 55581621183 is 38112618555.

55581621183 is a `hidden beast` number, since 5 + 5 + 5 + 8 + 1 + 621 + 18 + 3 = 666.

It is not a de Polignac number, because 55581621183 - 2⁹ = 55581620671 is a prime.

It is a super-2 number, since 2×55581621183² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55581621103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34161216 + ... + 34162842.

It is an arithmetic number, because the mean of its divisors is an integer number (963173640).

Almost surely, 2^55581621183 is an apocalyptic number.

55581621183 is a deficient number, since it is larger than the sum of its proper divisors (36883048257).

55581621183 is a wasteful number, since it uses less digits than its factorization.

55581621183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909 (or 1906 counting only the distinct ones).

The product of its digits is 288000, while the sum is 45.

The spelling of 55581621183 in words is "fifty-five billion, five hundred eighty-one million, six hundred twenty-one thousand, one hundred eighty-three".