168640061668 has 48 divisors (see below), whose sum is σ = 323914535280. Its totient is φ = 76342616064.

The previous prime is 168640061651. The next prime is 168640061669. The reversal of 168640061668 is 866160046861.

It is a happy number.

168640061668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 325153024 + 168314908644 = 18032^2 + 410262^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (168640061669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12276628 + ... + 12290356.

It is an arithmetic number, because the mean of its divisors is an integer number (6748219485).

Almost surely, 2^168640061668 is an apocalyptic number.

It is an amenable number.

168640061668 is a deficient number, since it is larger than the sum of its proper divisors (155274473612).

168640061668 is a wasteful number, since it uses less digits than its factorization.

168640061668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18256 (or 18254 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 168640061668 in words is "one hundred sixty-eight billion, six hundred forty million, sixty-one thousand, six hundred sixty-eight".