21663162454523 has 2 divisors, whose sum is σ = 21663162454524. Its totient is φ = 21663162454522.

The previous prime is 21663162454517. The next prime is 21663162454537. The reversal of 21663162454523 is 32545426136612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21663162454523 - 2⁸ = 21663162454267 is a prime.

It is not a weakly prime, because it can be changed into another prime (21663162454553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10831581227261 + 10831581227262.

It is an arithmetic number, because the mean of its divisors is an integer number (10831581227262).

Almost surely, 2^{21663162454523} is an apocalyptic number.

21663162454523 is a deficient number, since it is larger than the sum of its proper divisors (1).

21663162454523 is an equidigital number, since it uses as much as digits as its factorization.

21663162454523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6220800, while the sum is 50.

The spelling of 21663162454523 in words is "twenty-one trillion, six hundred sixty-three billion, one hundred sixty-two million, four hundred fifty-four thousand, five hundred twenty-three".