55643641 has 4 divisors (see below), whose sum is σ = 55728484. Its totient is φ = 55558800.

The previous prime is 55643639. The next prime is 55643681. The reversal of 55643641 is 14634655.

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 51782416 + 3861225 = 7196^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 55643641 - 2¹ = 55643639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55643597 and 55643606.

It is not an unprimeable number, because it can be changed into a prime (55643611) 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, 41430 + ... + 42751.

It is an arithmetic number, because the mean of its divisors is an integer number (13932121).

Almost surely, 2^55643641 is an apocalyptic number.

It is an amenable number.

55643641 is a deficient number, since it is larger than the sum of its proper divisors (84843).

55643641 is an equidigital number, since it uses as much as digits as its factorization.

55643641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84842.

The product of its digits is 43200, while the sum is 34.

The square root of 55643641 is about 7459.4665358858. The cubic root of 55643641 is about 381.7729730212.

The spelling of 55643641 in words is "fifty-five million, six hundred forty-three thousand, six hundred forty-one".