99999913823 has 4 divisors (see below), whose sum is σ = 100001050968. Its totient is φ = 99998776680.

The previous prime is 99999913753. The next prime is 99999913829. The reversal of 99999913823 is 32831999999.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99999913823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99999913829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424493 + ... + 616598.

It is an arithmetic number, because the mean of its divisors is an integer number (25000262742).

Almost surely, 2^99999913823 is an apocalyptic number.

99999913823 is a deficient number, since it is larger than the sum of its proper divisors (1137145).

99999913823 is a wasteful number, since it uses less digits than its factorization.

99999913823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1137144.

The product of its digits is 76527504, while the sum is 71.

The spelling of 99999913823 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred thirteen thousand, eight hundred twenty-three".