18447647956 has 24 divisors (see below), whose sum is σ = 33076382976. Its totient is φ = 8998516320.

The previous prime is 18447647887. The next prime is 18447647969. The reversal of 18447647956 is 65974674481.

It is a junction number, because it is equal to n+sod(n) for n = 18447647894 and 18447647903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99291 + ... + 216226.

It is an arithmetic number, because the mean of its divisors is an integer number (1378182624).

Almost surely, 2^18447647956 is an apocalyptic number.

It is an amenable number.

18447647956 is a deficient number, since it is larger than the sum of its proper divisors (14628735020).

18447647956 is a wasteful number, since it uses less digits than its factorization.

18447647956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315879 (or 315877 counting only the distinct ones).

The product of its digits is 40642560, while the sum is 61.

The spelling of 18447647956 in words is "eighteen billion, four hundred forty-seven million, six hundred forty-seven thousand, nine hundred fifty-six".