55005558 has 16 divisors (see below), whose sum is σ = 114794496. Its totient is φ = 17537960.

The previous prime is 55005553. The next prime is 55005583. The reversal of 55005558 is 85550055.

It is a super-3 number, since 3×55005558³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55005553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199158 + ... + 199433.

It is an arithmetic number, because the mean of its divisors is an integer number (7174656).

Almost surely, 2^55005558 is an apocalyptic number.

55005558 is an abundant number, since it is smaller than the sum of its proper divisors (59788938).

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

55005558 is a wasteful number, since it uses less digits than its factorization.

55005558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398619.

The product of its (nonzero) digits is 25000, while the sum is 33.

The square root of 55005558 is about 7416.5731979129. The cubic root of 55005558 is about 380.3080558324.

The spelling of 55005558 in words is "fifty-five million, five thousand, five hundred fifty-eight".