55335831381 has 12 divisors (see below), whose sum is σ = 80391556908. Its totient is φ = 36677313024.

The previous prime is 55335831371. The next prime is 55335831391. The reversal of 55335831381 is 18313853355.

55335831381 is a `hidden beast` number, since 5 + 5 + 33 + 583 + 1 + 38 + 1 = 666.

55335831381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55335831371) and next prime (55335831391).

It can be written as a sum of positive squares in 2 ways, for example, as 51060633156 + 4275198225 = 225966^2 + 65385^2 .

It is not a de Polignac number, because 55335831381 - 2⁷ = 55335831253 is a prime.

It is a super-2 number, since 2×55335831381² (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 (55335831361) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17768460 + ... + 17771573.

It is an arithmetic number, because the mean of its divisors is an integer number (6699296409).

Almost surely, 2^55335831381 is an apocalyptic number.

It is an amenable number.

55335831381 is a deficient number, since it is larger than the sum of its proper divisors (25055725527).

55335831381 is a wasteful number, since it uses less digits than its factorization.

55335831381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35540212 (or 35540209 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The spelling of 55335831381 in words is "fifty-five billion, three hundred thirty-five million, eight hundred thirty-one thousand, three hundred eighty-one".