555555638 has 8 divisors (see below), whose sum is σ = 909091080. Its totient is φ = 252525280.

The previous prime is 555555599. The next prime is 555555643. The reversal of 555555638 is 836555555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 555555592 and 555555601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12626243 + ... + 12626286.

It is an arithmetic number, because the mean of its divisors is an integer number (113636385).

Almost surely, 2^555555638 is an apocalyptic number.

555555638 is a deficient number, since it is larger than the sum of its proper divisors (353535442).

555555638 is a wasteful number, since it uses less digits than its factorization.

555555638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25252542.

The product of its digits is 2250000, while the sum is 47.

The square root of 555555638 is about 23570.2277884623. The cubic root of 555555638 is about 822.0707321086.

The spelling of 555555638 in words is "five hundred fifty-five million, five hundred fifty-five thousand, six hundred thirty-eight".