168721947119 has 4 divisors (see below), whose sum is σ = 184060305960. Its totient is φ = 153383588280.

The previous prime is 168721947109. The next prime is 168721947137. The reversal of 168721947119 is 911749127861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168721947119 - 2⁴ = 168721947103 is a prime.

It is a super-2 number, since 2×168721947119² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168721947109) 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, 7669179404 + ... + 7669179425.

It is an arithmetic number, because the mean of its divisors is an integer number (46015076490).

Almost surely, 2^168721947119 is an apocalyptic number.

168721947119 is a deficient number, since it is larger than the sum of its proper divisors (15338358841).

168721947119 is a wasteful number, since it uses less digits than its factorization.

168721947119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15338358840.

The product of its digits is 1524096, while the sum is 56.

The spelling of 168721947119 in words is "one hundred sixty-eight billion, seven hundred twenty-one million, nine hundred forty-seven thousand, one hundred nineteen".