55129566 has 16 divisors (see below), whose sum is σ = 110338704. Its totient is φ = 18363264.

The previous prime is 55129559. The next prime is 55129577. The reversal of 55129566 is 66592155.

It is a congruent 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, 9510 + ... + 14166.

It is an arithmetic number, because the mean of its divisors is an integer number (6896169).

Almost surely, 2^55129566 is an apocalyptic number.

55129566 is an abundant number, since it is smaller than the sum of its proper divisors (55209138).

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

55129566 is a wasteful number, since it uses less digits than its factorization.

55129566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6635.

The product of its digits is 81000, while the sum is 39.

The square root of 55129566 is about 7424.9286865262. The cubic root of 55129566 is about 380.5936381525.

The spelling of 55129566 in words is "fifty-five million, one hundred twenty-nine thousand, five hundred sixty-six".