18978316012 has 12 divisors (see below), whose sum is σ = 33432001456. Its totient is φ = 9426315600.

The previous prime is 18978316009. The next prime is 18978316013. The reversal of 18978316012 is 21061387981.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18978316013) 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, 15709923 + ... + 15711130.

Almost surely, 2^18978316012 is an apocalyptic number.

It is an amenable number.

18978316012 is a deficient number, since it is larger than the sum of its proper divisors (14453685444).

18978316012 is a wasteful number, since it uses less digits than its factorization.

18978316012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31421208 (or 31421206 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 18978316012 in words is "eighteen billion, nine hundred seventy-eight million, three hundred sixteen thousand, twelve".