18204657947 has 8 divisors (see below), whose sum is σ = 20834265600. Its totient is φ = 15582285864.

The previous prime is 18204657917. The next prime is 18204657959. The reversal of 18204657947 is 74975640281.

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 18204657947 - 2¹⁶ = 18204592411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18204657917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1803497 + ... + 1813562.

It is an arithmetic number, because the mean of its divisors is an integer number (2604283200).

Almost surely, 2^18204657947 is an apocalyptic number.

18204657947 is a deficient number, since it is larger than the sum of its proper divisors (2629607653).

18204657947 is an equidigital number, since it uses as much as digits as its factorization.

18204657947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3617785.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The spelling of 18204657947 in words is "eighteen billion, two hundred four million, six hundred fifty-seven thousand, nine hundred forty-seven".