194644381564 has 12 divisors (see below), whose sum is σ = 340661235600. Its totient is φ = 97312599968.

The previous prime is 194644381513. The next prime is 194644381571. The reversal of 194644381564 is 465183446491.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2351944 + ... + 2433295.

It is an arithmetic number, because the mean of its divisors is an integer number (28388436300).

Almost surely, 2^194644381564 is an apocalyptic number.

It is an amenable number.

194644381564 is a deficient number, since it is larger than the sum of its proper divisors (146016854036).

194644381564 is a wasteful number, since it uses less digits than its factorization.

194644381564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795412 (or 4795410 counting only the distinct ones).

The product of its digits is 9953280, while the sum is 55.

The spelling of 194644381564 in words is "one hundred ninety-four billion, six hundred forty-four million, three hundred eighty-one thousand, five hundred sixty-four".