194563653438 has 96 divisors (see below), whose sum is σ = 489001121280. Its totient is φ = 50517403200.

The previous prime is 194563653421. The next prime is 194563653443. The reversal of 194563653438 is 834356365491.

194563653438 is an astonishing number since 194563653438 = 194563 + ... + 653438.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 18650808 + ... + 18661236.

It is an arithmetic number, because the mean of its divisors is an integer number (5093761680).

Almost surely, 2^194563653438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 194563653438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244500560640).

194563653438 is an abundant number, since it is smaller than the sum of its proper divisors (294437467842).

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

194563653438 is a wasteful number, since it uses less digits than its factorization.

194563653438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14134 (or 14123 counting only the distinct ones).

The product of its digits is 27993600, while the sum is 57.

The spelling of 194563653438 in words is "one hundred ninety-four billion, five hundred sixty-three million, six hundred fifty-three thousand, four hundred thirty-eight".