55555538 has 4 divisors (see below), whose sum is σ = 83333310. Its totient is φ = 27777768.

The previous prime is 55555531. The next prime is 55555543. The reversal of 55555538 is 83555555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83555555 = 5 ⋅16711111.

It can be written as a sum of positive squares in only one way, i.e., 53831569 + 1723969 = 7337^2 + 1313^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55555495 and 55555504.

It is not an unprimeable number, because it can be changed into a prime (55555531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13888883 + ... + 13888886.

Almost surely, 2^55555538 is an apocalyptic number.

55555538 is a deficient number, since it is larger than the sum of its proper divisors (27777772).

55555538 is a wasteful number, since it uses less digits than its factorization.

55555538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27777771.

The product of its digits is 375000, while the sum is 41.

The square root of 55555538 is about 7453.5587473367. The cubic root of 55555538 is about 381.5713739923.

The spelling of 55555538 in words is "fifty-five million, five hundred fifty-five thousand, five hundred thirty-eight".