20516263123 has 2 divisors, whose sum is σ = 20516263124. Its totient is φ = 20516263122.

The previous prime is 20516263093. The next prime is 20516263129. The reversal of 20516263123 is 32136261502.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20516263123 - 2⁵ = 20516263091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20516263129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10258131561 + 10258131562.

It is an arithmetic number, because the mean of its divisors is an integer number (10258131562).

Almost surely, 2^20516263123 is an apocalyptic number.

20516263123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20516263123 is an equidigital number, since it uses as much as digits as its factorization.

20516263123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 31.

The spelling of 20516263123 in words is "twenty billion, five hundred sixteen million, two hundred sixty-three thousand, one hundred twenty-three".