99643860523 has 2 divisors, whose sum is σ = 99643860524. Its totient is φ = 99643860522.

The previous prime is 99643860499. The next prime is 99643860527. The reversal of 99643860523 is 32506834699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99643860523 - 2¹³ = 99643852331 is a prime.

It is not a weakly prime, because it can be changed into another prime (99643860527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49821930261 + 49821930262.

It is an arithmetic number, because the mean of its divisors is an integer number (49821930262).

Almost surely, 2^99643860523 is an apocalyptic number.

99643860523 is a deficient number, since it is larger than the sum of its proper divisors (1).

99643860523 is an equidigital number, since it uses as much as digits as its factorization.

99643860523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 55.

The spelling of 99643860523 in words is "ninety-nine billion, six hundred forty-three million, eight hundred sixty thousand, five hundred twenty-three".