55644644663 has 2 divisors, whose sum is σ = 55644644664. Its totient is φ = 55644644662.

The previous prime is 55644644603. The next prime is 55644644677. The reversal of 55644644663 is 36644644655.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55644644663 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55644644603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27822322331 + 27822322332.

It is an arithmetic number, because the mean of its divisors is an integer number (27822322332).

Almost surely, 2^55644644663 is an apocalyptic number.

55644644663 is a deficient number, since it is larger than the sum of its proper divisors (1).

55644644663 is an equidigital number, since it uses as much as digits as its factorization.

55644644663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24883200, while the sum is 53.

The spelling of 55644644663 in words is "fifty-five billion, six hundred forty-four million, six hundred forty-four thousand, six hundred sixty-three".