55505725 has 36 divisors (see below), whose sum is σ = 77182560. Its totient is φ = 39556000.

The previous prime is 55505719. The next prime is 55505753. The reversal of 55505725 is 52750555.

It is not a de Polignac number, because 55505725 - 2¹⁵ = 55472957 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 178320 + ... + 178630.

It is an arithmetic number, because the mean of its divisors is an integer number (2143960).

Almost surely, 2^55505725 is an apocalyptic number.

55505725 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

55505725 is a deficient number, since it is larger than the sum of its proper divisors (21676835).

55505725 is a wasteful number, since it uses less digits than its factorization.

55505725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 43750, while the sum is 34.

The square root of 55505725 is about 7450.2164398090. The cubic root of 55505725 is about 381.4572965651.

The spelling of 55505725 in words is "fifty-five million, five hundred five thousand, seven hundred twenty-five".