55555657 has 4 divisors (see below), whose sum is σ = 55571076. Its totient is φ = 55540240.

The previous prime is 55555651. The next prime is 55555679. The reversal of 55555657 is 75655555.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 32936121 + 22619536 = 5739^2 + 4756^2 .

It is a cyclic number.

It is not a de Polignac number, because 55555657 - 2¹¹ = 55553609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55555651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 903 + ... + 10579.

It is an arithmetic number, because the mean of its divisors is an integer number (13892769).

Almost surely, 2^55555657 is an apocalyptic number.

It is an amenable number.

55555657 is a deficient number, since it is larger than the sum of its proper divisors (15419).

55555657 is an equidigital number, since it uses as much as digits as its factorization.

55555657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15418.

The product of its digits is 656250, while the sum is 43.

The square root of 55555657 is about 7453.5667300964. The cubic root of 55555657 is about 381.5716464341.

The spelling of 55555657 in words is "fifty-five million, five hundred fifty-five thousand, six hundred fifty-seven".