191269199646 has 144 divisors (see below), whose sum is σ = 493742456064. Its totient is φ = 53328246048.

The previous prime is 191269199621. The next prime is 191269199651. The reversal of 191269199646 is 646991962191.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 65345035 + ... + 65347961.

It is an arithmetic number, because the mean of its divisors is an integer number (3428767056).

Almost surely, 2^191269199646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191269199646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246871228032).

191269199646 is an abundant number, since it is smaller than the sum of its proper divisors (302473256418).

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

191269199646 is a wasteful number, since it uses less digits than its factorization.

191269199646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4715 (or 4705 counting only the distinct ones).

The product of its digits is 11337408, while the sum is 63.

The spelling of 191269199646 in words is "one hundred ninety-one billion, two hundred sixty-nine million, one hundred ninety-nine thousand, six hundred forty-six".