20623501663 has 2 divisors, whose sum is σ = 20623501664. Its totient is φ = 20623501662.

The previous prime is 20623501649. The next prime is 20623501673. The reversal of 20623501663 is 36610532602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20623501663 - 2¹⁷ = 20623370591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20623501673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10311750831 + 10311750832.

It is an arithmetic number, because the mean of its divisors is an integer number (10311750832).

Almost surely, 2^20623501663 is an apocalyptic number.

20623501663 is a deficient number, since it is larger than the sum of its proper divisors (1).

20623501663 is an equidigital number, since it uses as much as digits as its factorization.

20623501663 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 34.

The spelling of 20623501663 in words is "twenty billion, six hundred twenty-three million, five hundred one thousand, six hundred sixty-three".