191915016681 has 8 divisors (see below), whose sum is σ = 255923487360. Its totient is φ = 127924945232.

The previous prime is 191915016677. The next prime is 191915016697. The reversal of 191915016681 is 186610519191.

191915016681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191915016681 - 2² = 191915016677 is a prime.

It is a super-2 number, since 2×191915016681² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191915016681.

It is not an unprimeable number, because it can be changed into a prime (191915016641) 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, 4575450 + ... + 4617203.

It is an arithmetic number, because the mean of its divisors is an integer number (31990435920).

Almost surely, 2^191915016681 is an apocalyptic number.

It is an amenable number.

191915016681 is a deficient number, since it is larger than the sum of its proper divisors (64008470679).

191915016681 is an equidigital number, since it uses as much as digits as its factorization.

191915016681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9199615.

The product of its (nonzero) digits is 116640, while the sum is 48.

The spelling of 191915016681 in words is "one hundred ninety-one billion, nine hundred fifteen million, sixteen thousand, six hundred eighty-one".