18947794945 has 8 divisors (see below), whose sum is σ = 23166360936. Its totient is φ = 14872231296.

The previous prime is 18947794939. The next prime is 18947794961. The reversal of 18947794945 is 54949774981.

It can be written as a sum of positive squares in 4 ways, for example, as 2111953936 + 16835841009 = 45956^2 + 129753^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18947794945 - 2⁹ = 18947794433 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35750292 + ... + 35750821.

It is an arithmetic number, because the mean of its divisors is an integer number (2895795117).

Almost surely, 2^18947794945 is an apocalyptic number.

It is an amenable number.

18947794945 is a deficient number, since it is larger than the sum of its proper divisors (4218565991).

18947794945 is an equidigital number, since it uses as much as digits as its factorization.

18947794945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71501171.

The product of its digits is 91445760, while the sum is 67.

The spelling of 18947794945 in words is "eighteen billion, nine hundred forty-seven million, seven hundred ninety-four thousand, nine hundred forty-five".