20123523899 has 2 divisors, whose sum is σ = 20123523900. Its totient is φ = 20123523898.

The previous prime is 20123523887. The next prime is 20123523907. The reversal of 20123523899 is 99832532102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20123523899 - 2⁸ = 20123523643 is a prime.

It is a super-2 number, since 2×20123523899² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20123523809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061761949 + 10061761950.

It is an arithmetic number, because the mean of its divisors is an integer number (10061761950).

Almost surely, 2^20123523899 is an apocalyptic number.

20123523899 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123523899 is an equidigital number, since it uses as much as digits as its factorization.

20123523899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 20123523899 in words is "twenty billion, one hundred twenty-three million, five hundred twenty-three thousand, eight hundred ninety-nine".