55561550 has 24 divisors (see below), whose sum is σ = 112740552. Its totient is φ = 20204000.

The previous prime is 55561549. The next prime is 55561573. The reversal of 55561550 is 5516555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49961 + ... + 51060.

It is an arithmetic number, because the mean of its divisors is an integer number (4697523).

Almost surely, 2^55561550 is an apocalyptic number.

55561550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55561550 is an abundant number, since it is smaller than the sum of its proper divisors (57179002).

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

55561550 is a wasteful number, since it uses less digits than its factorization.

55561550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101044 (or 101039 counting only the distinct ones).

The product of its (nonzero) digits is 18750, while the sum is 32.

The square root of 55561550 is about 7453.9620337107. The cubic root of 55561550 is about 381.5851375427.

The spelling of 55561550 in words is "fifty-five million, five hundred sixty-one thousand, five hundred fifty".