18447474012 has 24 divisors (see below), whose sum is σ = 46957206912. Its totient is φ = 5590143600.

The previous prime is 18447474007. The next prime is 18447474013. The reversal of 18447474012 is 21047474481.

It is a super-2 number, since 2×18447474012² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18447474013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69876664 + ... + 69876927.

It is an arithmetic number, because the mean of its divisors is an integer number (1956550288).

Almost surely, 2^18447474012 is an apocalyptic number.

18447474012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18447474012 is an abundant number, since it is smaller than the sum of its proper divisors (28509732900).

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

18447474012 is a wasteful number, since it uses less digits than its factorization.

18447474012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139753609 (or 139753607 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 42.

The spelling of 18447474012 in words is "eighteen billion, four hundred forty-seven million, four hundred seventy-four thousand, twelve".