221655563662807 has 2 divisors, whose sum is σ = 221655563662808. Its totient is φ = 221655563662806.

The previous prime is 221655563662759. The next prime is 221655563662853. The reversal of 221655563662807 is 708266365556122.

221655563662807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221655563662807 - 2⁷ = 221655563662679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221655560662807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110827781831403 + 110827781831404.

It is an arithmetic number, because the mean of its divisors is an integer number (110827781831404).

Almost surely, 2^{221655563662807} is an apocalyptic number.

221655563662807 is a deficient number, since it is larger than the sum of its proper divisors (1).

221655563662807 is an equidigital number, since it uses as much as digits as its factorization.

221655563662807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728000, while the sum is 64.

The spelling of 221655563662807 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, five hundred sixty-three million, six hundred sixty-two thousand, eight hundred seven".