221543775523663 has 2 divisors, whose sum is σ = 221543775523664. Its totient is φ = 221543775523662.

The previous prime is 221543775523607. The next prime is 221543775523709. The reversal of 221543775523663 is 366325577345122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221543775523663 - 2²¹ = 221543773426511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221543775523363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110771887761831 + 110771887761832.

It is an arithmetic number, because the mean of its divisors is an integer number (110771887761832).

Almost surely, 2^{221543775523663} is an apocalyptic number.

221543775523663 is a deficient number, since it is larger than the sum of its proper divisors (1).

221543775523663 is an equidigital number, since it uses as much as digits as its factorization.

221543775523663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512000, while the sum is 61.

The spelling of 221543775523663 in words is "two hundred twenty-one trillion, five hundred forty-three billion, seven hundred seventy-five million, five hundred twenty-three thousand, six hundred sixty-three".