55540639405 has 4 divisors (see below), whose sum is σ = 66648767292. Its totient is φ = 44432511520.

The previous prime is 55540639391. The next prime is 55540639409. The reversal of 55540639405 is 50493604555.

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 29652151204 + 25888488201 = 172198^2 + 160899^2 .

It is not a de Polignac number, because 55540639405 - 2⁵ = 55540639373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55540639409) 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 3 ways as a sum of consecutive naturals, for example, 5554063936 + ... + 5554063945.

It is an arithmetic number, because the mean of its divisors is an integer number (16662191823).

Almost surely, 2^55540639405 is an apocalyptic number.

It is an amenable number.

55540639405 is a deficient number, since it is larger than the sum of its proper divisors (11108127887).

55540639405 is a wasteful number, since it uses less digits than its factorization.

55540639405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11108127886.

The product of its (nonzero) digits is 1620000, while the sum is 46.

The spelling of 55540639405 in words is "fifty-five billion, five hundred forty million, six hundred thirty-nine thousand, four hundred five".