168206948991 has 24 divisors (see below), whose sum is σ = 245790923040. Its totient is φ = 110834946816.

The previous prime is 168206948981. The next prime is 168206948993. The reversal of 168206948991 is 199849602861.

168206948991 is a `hidden beast` number, since 1 + 6 + 8 + 2 + 0 + 69 + 489 + 91 = 666.

It is not a de Polignac number, because 168206948991 - 2⁶ = 168206948927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168206948993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2093635 + ... + 2172491.

It is an arithmetic number, because the mean of its divisors is an integer number (10241288460).

Almost surely, 2^168206948991 is an apocalyptic number.

168206948991 is a deficient number, since it is larger than the sum of its proper divisors (77583974049).

168206948991 is a wasteful number, since it uses less digits than its factorization.

168206948991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81615 (or 81612 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 63.

The spelling of 168206948991 in words is "one hundred sixty-eight billion, two hundred six million, nine hundred forty-eight thousand, nine hundred ninety-one".