18721757896 has 16 divisors (see below), whose sum is σ = 35122579200. Its totient is φ = 9355736784.

The previous prime is 18721757869. The next prime is 18721757903. The reversal of 18721757896 is 69875712781.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 627276 + ... + 656443.

It is an arithmetic number, because the mean of its divisors is an integer number (2195161200).

Almost surely, 2^18721757896 is an apocalyptic number.

It is an amenable number.

18721757896 is a deficient number, since it is larger than the sum of its proper divisors (16400821304).

18721757896 is a wasteful number, since it uses less digits than its factorization.

18721757896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285548 (or 1285544 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 61.

The spelling of 18721757896 in words is "eighteen billion, seven hundred twenty-one million, seven hundred fifty-seven thousand, eight hundred ninety-six".