168640057747 has 16 divisors (see below), whose sum is σ = 202915952640. Its totient is φ = 136913329728.

The previous prime is 168640057727. The next prime is 168640057759. The reversal of 168640057747 is 747750046861.

168640057747 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 168640057747 - 2¹⁹ = 168639533459 is a prime.

It is a super-2 number, since 2×168640057747² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168640057727) 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, 551943 + ... + 801199.

It is an arithmetic number, because the mean of its divisors is an integer number (12682247040).

Almost surely, 2^168640057747 is an apocalyptic number.

168640057747 is a deficient number, since it is larger than the sum of its proper divisors (34275894893).

168640057747 is a wasteful number, since it uses less digits than its factorization.

168640057747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254370.

The product of its (nonzero) digits is 7902720, while the sum is 55.

The spelling of 168640057747 in words is "one hundred sixty-eight billion, six hundred forty million, fifty-seven thousand, seven hundred forty-seven".