18478860953 has 4 divisors (see below), whose sum is σ = 21118698240. Its totient is φ = 15839023668.

The previous prime is 18478860943. The next prime is 18478861067. The reversal of 18478860953 is 35906887481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18478860953 - 2²⁶ = 18411752089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18478860892 and 18478860901.

It is not an unprimeable number, because it can be changed into a prime (18478860943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1319918633 + ... + 1319918646.

It is an arithmetic number, because the mean of its divisors is an integer number (5279674560).

Almost surely, 2^18478860953 is an apocalyptic number.

It is an amenable number.

18478860953 is a deficient number, since it is larger than the sum of its proper divisors (2639837287).

18478860953 is an equidigital number, since it uses as much as digits as its factorization.

18478860953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639837286.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 18478860953 in words is "eighteen billion, four hundred seventy-eight million, eight hundred sixty thousand, nine hundred fifty-three".