55644643 has 2 divisors, whose sum is σ = 55644644. Its totient is φ = 55644642.

The previous prime is 55644629. The next prime is 55644683. The reversal of 55644643 is 34644655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55644643 - 2¹⁷ = 55513571 is a prime.

It is not a weakly prime, because it can be changed into another prime (55644683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27822321 + 27822322.

It is an arithmetic number, because the mean of its divisors is an integer number (27822322).

Almost surely, 2^55644643 is an apocalyptic number.

55644643 is a deficient number, since it is larger than the sum of its proper divisors (1).

55644643 is an equidigital number, since it uses as much as digits as its factorization.

55644643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 37.

The square root of 55644643 is about 7459.5336985632. The cubic root of 55644643 is about 381.7752645931.

The spelling of 55644643 in words is "fifty-five million, six hundred forty-four thousand, six hundred forty-three".