55405554 has 16 divisors (see below), whose sum is σ = 111888192. Its totient is φ = 18289008.

The previous prime is 55405541. The next prime is 55405561. The reversal of 55405554 is 45550455.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44209 + ... + 45444.

It is an arithmetic number, because the mean of its divisors is an integer number (6993012).

Almost surely, 2^55405554 is an apocalyptic number.

55405554 is an abundant number, since it is smaller than the sum of its proper divisors (56482638).

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

55405554 is a wasteful number, since it uses less digits than its factorization.

55405554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89761.

The product of its (nonzero) digits is 50000, while the sum is 33.

The square root of 55405554 is about 7443.4907133683. The cubic root of 55405554 is about 381.2276868066.

The spelling of 55405554 in words is "fifty-five million, four hundred five thousand, five hundred fifty-four".