18948338978 has 8 divisors (see below), whose sum is σ = 29083497168. Its totient is φ = 9253839924.

The previous prime is 18948338977. The next prime is 18948338989. The reversal of 18948338978 is 87983384981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18948338977) 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, 110164676 + ... + 110164847.

It is an arithmetic number, because the mean of its divisors is an integer number (3635437146).

Almost surely, 2^18948338978 is an apocalyptic number.

18948338978 is a deficient number, since it is larger than the sum of its proper divisors (10135158190).

18948338978 is a wasteful number, since it uses less digits than its factorization.

18948338978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220329568.

The product of its digits is 83607552, while the sum is 68.

The spelling of 18948338978 in words is "eighteen billion, nine hundred forty-eight million, three hundred thirty-eight thousand, nine hundred seventy-eight".