18514030978 has 8 divisors (see below), whose sum is σ = 27832898700. Its totient is φ = 9236398080.

The previous prime is 18514030973. The next prime is 18514031051. The reversal of 18514030978 is 87903041581.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17317770409 + 1196260569 = 131597^2 + 34587^2 .

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 (18514030973) 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, 10307583 + ... + 10309378.

Almost surely, 2^18514030978 is an apocalyptic number.

18514030978 is a deficient number, since it is larger than the sum of its proper divisors (9318867722).

18514030978 is a wasteful number, since it uses less digits than its factorization.

18514030978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20617412.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 18514030978 in words is "eighteen billion, five hundred fourteen million, thirty thousand, nine hundred seventy-eight".