18985948705 has 4 divisors (see below), whose sum is σ = 22783138452. Its totient is φ = 15188758960.

The previous prime is 18985948699. The next prime is 18985948733. The reversal of 18985948705 is 50784958981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50784958981 = 4211 ⋅12060071.

It can be written as a sum of positive squares in 2 ways, for example, as 12501028864 + 6484919841 = 111808^2 + 80529^2 .

It is not a de Polignac number, because 18985948705 - 2⁵ = 18985948673 is a prime.

It is a Duffinian 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, 1898594866 + ... + 1898594875.

It is an arithmetic number, because the mean of its divisors is an integer number (5695784613).

Almost surely, 2^18985948705 is an apocalyptic number.

It is an amenable number.

18985948705 is a deficient number, since it is larger than the sum of its proper divisors (3797189747).

18985948705 is an equidigital number, since it uses as much as digits as its factorization.

18985948705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797189746.

The product of its (nonzero) digits is 29030400, while the sum is 64.

The spelling of 18985948705 in words is "eighteen billion, nine hundred eighty-five million, nine hundred forty-eight thousand, seven hundred five".