19198264644 has 144 divisors (see below), whose sum is σ = 53468251200. Its totient is φ = 5772033792.

The previous prime is 19198264643. The next prime is 19198264661. The reversal of 19198264644 is 44646289191.

19198264644 is a `hidden beast` number, since 1 + 91 + 98 + 2 + 6 + 464 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (19198264643) 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, 4774867 + ... + 4778885.

It is an arithmetic number, because the mean of its divisors is an integer number (371307300).

Almost surely, 2^19198264644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19198264644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26734125600).

19198264644 is an abundant number, since it is smaller than the sum of its proper divisors (34269986556).

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

19198264644 is a wasteful number, since it uses less digits than its factorization.

19198264644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274 (or 4269 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The spelling of 19198264644 in words is "nineteen billion, one hundred ninety-eight million, two hundred sixty-four thousand, six hundred forty-four".