168640057749 has 16 divisors (see below), whose sum is σ = 238088600640. Its totient is φ = 105809583360.

The previous prime is 168640057727. The next prime is 168640057759. The reversal of 168640057749 is 947750046861.

168640057749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-168640057749 is a prime.

It is a super-3 number, since 3×168640057749³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168640057759) 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 15 ways as a sum of consecutive naturals, for example, 2271679 + ... + 2344739.

It is an arithmetic number, because the mean of its divisors is an integer number (14880537540).

Almost surely, 2^168640057749 is an apocalyptic number.

It is an amenable number.

168640057749 is a deficient number, since it is larger than the sum of its proper divisors (69448542891).

168640057749 is a wasteful number, since it uses less digits than its factorization.

168640057749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118340.

The product of its (nonzero) digits is 10160640, while the sum is 57.

The spelling of 168640057749 in words is "one hundred sixty-eight billion, six hundred forty million, fifty-seven thousand, seven hundred forty-nine".