18442477812 has 144 divisors (see below), whose sum is σ = 51306829056. Its totient is φ = 5131315200.

The previous prime is 18442477811. The next prime is 18442477843. The reversal of 18442477812 is 21877424481.

It is a super-2 number, since 2×18442477812² (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 (18442477811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1002933 + ... + 1021155.

It is an arithmetic number, because the mean of its divisors is an integer number (356297424).

Almost surely, 2^18442477812 is an apocalyptic number.

18442477812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18442477812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25653414528).

18442477812 is an abundant number, since it is smaller than the sum of its proper divisors (32864351244).

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

18442477812 is a wasteful number, since it uses less digits than its factorization.

18442477812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18310 (or 18297 counting only the distinct ones).

The product of its digits is 802816, while the sum is 48.

The spelling of 18442477812 in words is "eighteen billion, four hundred forty-two million, four hundred seventy-seven thousand, eight hundred twelve".