18886299805 has 4 divisors (see below), whose sum is σ = 22663559772. Its totient is φ = 15109039840.

The previous prime is 18886299727. The next prime is 18886299827. The reversal of 18886299805 is 50899268881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50899268881 = 71 ⋅716891111.

It can be written as a sum of positive squares in 2 ways, for example, as 2020862116 + 16865437689 = 44954^2 + 129867^2 .

It is not a de Polignac number, because 18886299805 - 2¹¹ = 18886297757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888629976 + ... + 1888629985.

It is an arithmetic number, because the mean of its divisors is an integer number (5665889943).

Almost surely, 2^18886299805 is an apocalyptic number.

It is an amenable number.

18886299805 is a deficient number, since it is larger than the sum of its proper divisors (3777259967).

18886299805 is an equidigital number, since it uses as much as digits as its factorization.

18886299805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3777259966.

The product of its (nonzero) digits is 19906560, while the sum is 64.

The spelling of 18886299805 in words is "eighteen billion, eight hundred eighty-six million, two hundred ninety-nine thousand, eight hundred five".