191691794512 has 20 divisors (see below), whose sum is σ = 371415977856. Its totient is φ = 95842509920.

The previous prime is 191691794473. The next prime is 191691794513. The reversal of 191691794512 is 215497196191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191691794513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291393 + ... + 684319.

Almost surely, 2^191691794512 is an apocalyptic number.

It is an amenable number.

191691794512 is a deficient number, since it is larger than the sum of its proper divisors (179724183344).

191691794512 is a wasteful number, since it uses less digits than its factorization.

191691794512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423426 (or 423420 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 55.

The spelling of 191691794512 in words is "one hundred ninety-one billion, six hundred ninety-one million, seven hundred ninety-four thousand, five hundred twelve".