38699709858818 has 18 divisors (see below), whose sum is σ = 58189665957129. Its totient is φ = 19303266740832.

The previous prime is 38699709858781. The next prime is 38699709858869. The reversal of 38699709858818 is 81885890799683.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 31561103777329 + 7138606081489 = 5617927^2 + 2671817^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=4398847.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3809396423 + ... + 3809406581.

Almost surely, 2^{38699709858818} is an apocalyptic number.

38699709858818 is a deficient number, since it is larger than the sum of its proper divisors (19489956098311).

38699709858818 is an frugal number, since it uses more digits than its factorization.

38699709858818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21186 (or 10594 counting only the distinct ones).

The product of its (nonzero) digits is 15049359360, while the sum is 89.

The spelling of 38699709858818 in words is "thirty-eight trillion, six hundred ninety-nine billion, seven hundred nine million, eight hundred fifty-eight thousand, eight hundred eighteen".