99518388381599 has 16 divisors (see below), whose sum is σ = 114396459079680. Its totient is φ = 85621889266560.

The previous prime is 99518388381563. The next prime is 99518388381631.

99518388381599 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 99518388381599 - 2¹² = 99518388377503 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 99518388381599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99518388381509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243482879 + ... + 243891264.

It is an arithmetic number, because the mean of its divisors is an integer number (7149778692480).

Almost surely, 2^{99518388381599} is an apocalyptic number.

99518388381599 is a deficient number, since it is larger than the sum of its proper divisors (14878070698081).

99518388381599 is a wasteful number, since it uses less digits than its factorization.

99518388381599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487375150.

The product of its digits is 6046617600, while the sum is 86.

The spelling of 99518388381599 in words is "ninety-nine trillion, five hundred eighteen billion, three hundred eighty-eight million, three hundred eighty-one thousand, five hundred ninety-nine".