18438606012 has 48 divisors (see below), whose sum is σ = 45908226560. Its totient is φ = 5742949248.

The previous prime is 18438605987. The next prime is 18438606019. The reversal of 18438606012 is 21060683481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438606019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537268 + ... + 570555.

Almost surely, 2^18438606012 is an apocalyptic number.

18438606012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18438606012 is an abundant number, since it is smaller than the sum of its proper divisors (27469620548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18438606012 is a wasteful number, since it uses less digits than its factorization.

18438606012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107922 (or 1107920 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 39.

The spelling of 18438606012 in words is "eighteen billion, four hundred thirty-eight million, six hundred six thousand, twelve".