191283319640 has 64 divisors (see below), whose sum is σ = 499212806400. Its totient is φ = 64603997568.

The previous prime is 191283319637. The next prime is 191283319649. The reversal of 191283319640 is 46913382191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191283319649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5079410 + ... + 5116929.

It is an arithmetic number, because the mean of its divisors is an integer number (7800200100).

Almost surely, 2^191283319640 is an apocalyptic number.

191283319640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191283319640 is an abundant number, since it is smaller than the sum of its proper divisors (307929486760).

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

191283319640 is a wasteful number, since it uses less digits than its factorization.

191283319640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10196424 (or 10196420 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 191283319640 in words is "one hundred ninety-one billion, two hundred eighty-three million, three hundred nineteen thousand, six hundred forty".