55625561 has 4 divisors (see below), whose sum is σ = 56982324. Its totient is φ = 54268800.

The previous prime is 55625551. The next prime is 55625573. The reversal of 55625561 is 16552655.

55625561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22505536 + 33120025 = 4744^2 + 5755^2 .

It is a cyclic number.

It is not a de Polignac number, because 55625561 - 2⁶ = 55625497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55625551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678320 + ... + 678401.

It is an arithmetic number, because the mean of its divisors is an integer number (14245581).

Almost surely, 2^55625561 is an apocalyptic number.

It is an amenable number.

55625561 is a deficient number, since it is larger than the sum of its proper divisors (1356763).

55625561 is a wasteful number, since it uses less digits than its factorization.

55625561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356762.

The product of its digits is 45000, while the sum is 35.

The square root of 55625561 is about 7458.2545545188. The cubic root of 55625561 is about 381.7316193705.

The spelling of 55625561 in words is "fifty-five million, six hundred twenty-five thousand, five hundred sixty-one".