55641647 has 4 divisors (see below), whose sum is σ = 55657560. Its totient is φ = 55625736.

The previous prime is 55641637. The next prime is 55641659. The reversal of 55641647 is 74614655.

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

It is a cyclic number.

It is not a de Polignac number, because 55641647 - 2⁴ = 55641631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55641647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55641637) 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, 173 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (13914390).

Almost surely, 2^55641647 is an apocalyptic number.

55641647 is a deficient number, since it is larger than the sum of its proper divisors (15913).

55641647 is a wasteful number, since it uses less digits than its factorization.

55641647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15912.

The product of its digits is 100800, while the sum is 38.

The square root of 55641647 is about 7459.3328790181. The cubic root of 55641647 is about 381.7684126654.

The spelling of 55641647 in words is "fifty-five million, six hundred forty-one thousand, six hundred forty-seven".