168542111749 has 4 divisors (see below), whose sum is σ = 183864121920. Its totient is φ = 153220101580.

The previous prime is 168542111743. The next prime is 168542111809. The reversal of 168542111749 is 947111245861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 168542111749 - 2³ = 168542111741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168542111741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7661005069 + ... + 7661005090.

It is an arithmetic number, because the mean of its divisors is an integer number (45966030480).

Almost surely, 2^168542111749 is an apocalyptic number.

It is an amenable number.

168542111749 is a deficient number, since it is larger than the sum of its proper divisors (15322010171).

168542111749 is a wasteful number, since it uses less digits than its factorization.

168542111749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15322010170.

The product of its digits is 483840, while the sum is 49.

The spelling of 168542111749 in words is "one hundred sixty-eight billion, five hundred forty-two million, one hundred eleven thousand, seven hundred forty-nine".