191636394340 has 24 divisors (see below), whose sum is σ = 403205927040. Its totient is φ = 76507986528.

The previous prime is 191636394337. The next prime is 191636394347. The reversal of 191636394340 is 43493636191.

191636394340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (191636394347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9149980 + ... + 9170899.

It is an arithmetic number, because the mean of its divisors is an integer number (16800246960).

Almost surely, 2^191636394340 is an apocalyptic number.

191636394340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

191636394340 is an abundant number, since it is smaller than the sum of its proper divisors (211569532700).

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

191636394340 is a wasteful number, since it uses less digits than its factorization.

191636394340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18321411 (or 18321409 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 49.

The spelling of 191636394340 in words is "one hundred ninety-one billion, six hundred thirty-six million, three hundred ninety-four thousand, three hundred forty".