55561725 has 18 divisors (see below), whose sum is σ = 99517626. Its totient is φ = 29632800.

The previous prime is 55561711. The next prime is 55561733. The reversal of 55561725 is 52716555.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 6365529 + 49196196 = 2523^2 + 7014^2 .

It is not a de Polignac number, because 55561725 - 2⁸ = 55561469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55561725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 123246 + ... + 123695.

It is an arithmetic number, because the mean of its divisors is an integer number (5528757).

Almost surely, 2^55561725 is an apocalyptic number.

It is an amenable number.

55561725 is a deficient number, since it is larger than the sum of its proper divisors (43955901).

55561725 is a wasteful number, since it uses less digits than its factorization.

55561725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246957 (or 246949 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 55561725 is about 7453.9737724250. The cubic root of 55561725 is about 381.5855381635.

The spelling of 55561725 in words is "fifty-five million, five hundred sixty-one thousand, seven hundred twenty-five".