18313562899 has 4 divisors (see below), whose sum is σ = 18331714120. Its totient is φ = 18295411680.

The previous prime is 18313562837. The next prime is 18313562909. The reversal of 18313562899 is 99826531381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99826531381 = 137 ⋅728660813.

It is a cyclic number.

It is not a de Polignac number, because 18313562899 - 2²¹ = 18311465747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18313568899) 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, 9074097 + ... + 9076114.

It is an arithmetic number, because the mean of its divisors is an integer number (4582928530).

Almost surely, 2^18313562899 is an apocalyptic number.

18313562899 is a deficient number, since it is larger than the sum of its proper divisors (18151221).

18313562899 is a wasteful number, since it uses less digits than its factorization.

18313562899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18151220.

The product of its digits is 2799360, while the sum is 55.

The spelling of 18313562899 in words is "eighteen billion, three hundred thirteen million, five hundred sixty-two thousand, eight hundred ninety-nine".