55555542 has 48 divisors (see below), whose sum is σ = 138158592. Its totient is φ = 15804720.

The previous prime is 55555531. The next prime is 55555543. The reversal of 55555542 is 24555555.

55555542 is a `hidden beast` number, since 55 + 55 + 554 + 2 = 666.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55555497 and 55555506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55555543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33333 + ... + 34959.

It is an arithmetic number, because the mean of its divisors is an integer number (2878304).

Almost surely, 2^55555542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55555542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69079296).

55555542 is an abundant number, since it is smaller than the sum of its proper divisors (82603050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55555542 is a wasteful number, since it uses less digits than its factorization.

55555542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1910 counting only the distinct ones).

The product of its digits is 125000, while the sum is 36.

The square root of 55555542 is about 7453.5590156649. The cubic root of 55555542 is about 381.5713831500.

The spelling of 55555542 in words is "fifty-five million, five hundred fifty-five thousand, five hundred forty-two".