55605645 has 24 divisors (see below), whose sum is σ = 97826976. Its totient is φ = 29212128.

The previous prime is 55605643. The next prime is 55605659. The reversal of 55605645 is 54650655.

It is a happy number.

55605645 is a `hidden beast` number, since 5 + 5 + 6 + 0 + 5 + 645 = 666.

55605645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55605645 - 2¹ = 55605643 is a prime.

It is a super-3 number, since 3×55605645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55605643) 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 23 ways as a sum of consecutive naturals, for example, 6207 + ... + 12236.

It is an arithmetic number, because the mean of its divisors is an integer number (4076124).

Almost surely, 2^55605645 is an apocalyptic number.

It is an amenable number.

55605645 is a deficient number, since it is larger than the sum of its proper divisors (42221331).

55605645 is a wasteful number, since it uses less digits than its factorization.

55605645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18521 (or 18518 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

The square root of 55605645 is about 7456.9192700471. The cubic root of 55605645 is about 381.6860559382.

The spelling of 55605645 in words is "fifty-five million, six hundred five thousand, six hundred forty-five".