19418220444 has 24 divisors (see below), whose sum is σ = 51781921408. Its totient is φ = 5548062960.

The previous prime is 19418220439. The next prime is 19418220449. The reversal of 19418220444 is 44402281491.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (19418220439) and next prime (19418220449).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19418220449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115584562 + ... + 115584729.

Almost surely, 2^19418220444 is an apocalyptic number.

19418220444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

19418220444 is an abundant number, since it is smaller than the sum of its proper divisors (32363700964).

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

19418220444 is a wasteful number, since it uses less digits than its factorization.

19418220444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231169305 (or 231169303 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 39.

The spelling of 19418220444 in words is "nineteen billion, four hundred eighteen million, two hundred twenty thousand, four hundred forty-four".