191686082868 has 288 divisors, whose sum is σ = 603228487680. Its totient is φ = 50122575360.

The previous prime is 191686082867. The next prime is 191686082873. The reversal of 191686082868 is 868280686191.

191686082868 is a `hidden beast` number, since 1 + 9 + 16 + 8 + 608 + 2 + 8 + 6 + 8 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191686082867) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 15985171 + ... + 15997157.

It is an arithmetic number, because the mean of its divisors is an integer number (2094543360).

Almost surely, 2^191686082868 is an apocalyptic number.

191686082868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 191686082868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (301614243840).

191686082868 is an abundant number, since it is smaller than the sum of its proper divisors (411542404812).

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

191686082868 is a wasteful number, since it uses less digits than its factorization.

191686082868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12147 (or 12142 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 63.

The spelling of 191686082868 in words is "one hundred ninety-one billion, six hundred eighty-six million, eighty-two thousand, eight hundred sixty-eight".