20123544523 has 2 divisors, whose sum is σ = 20123544524. Its totient is φ = 20123544522.

The previous prime is 20123544479. The next prime is 20123544527. The reversal of 20123544523 is 32544532102.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20123544523 is a prime.

It is not a weakly prime, because it can be changed into another prime (20123544527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061772261 + 10061772262.

It is an arithmetic number, because the mean of its divisors is an integer number (10061772262).

Almost surely, 2^20123544523 is an apocalyptic number.

20123544523 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123544523 is an equidigital number, since it uses as much as digits as its factorization.

20123544523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 31.

The spelling of 20123544523 in words is "twenty billion, one hundred twenty-three million, five hundred forty-four thousand, five hundred twenty-three".