18204657956 has 48 divisors (see below), whose sum is σ = 32920183296. Its totient is φ = 8803843584.

The previous prime is 18204657917. The next prime is 18204657959. The reversal of 18204657956 is 65975640281.

It is a junction number, because it is equal to n+sod(n) for n = 18204657898 and 18204657907.

It is not an unprimeable number, because it can be changed into a prime (18204657959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16594400 + ... + 16595496.

It is an arithmetic number, because the mean of its divisors is an integer number (685837152).

Almost surely, 2^18204657956 is an apocalyptic number.

It is an amenable number.

18204657956 is a deficient number, since it is larger than the sum of its proper divisors (14715525340).

18204657956 is a wasteful number, since it uses less digits than its factorization.

18204657956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2108 (or 2106 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 18204657956 in words is "eighteen billion, two hundred four million, six hundred fifty-seven thousand, nine hundred fifty-six".