168640057693 has 8 divisors (see below), whose sum is σ = 171828975456. Its totient is φ = 165451400400.

The previous prime is 168640057679. The next prime is 168640057723. The reversal of 168640057693 is 396750046861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168640057693 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 (168640057673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1679598 + ... + 1777168.

It is an arithmetic number, because the mean of its divisors is an integer number (21478621932).

Almost surely, 2^168640057693 is an apocalyptic number.

It is an amenable number.

168640057693 is a deficient number, since it is larger than the sum of its proper divisors (3188917763).

168640057693 is an equidigital number, since it uses as much as digits as its factorization.

168640057693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130235.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 168640057693 in words is "one hundred sixty-eight billion, six hundred forty million, fifty-seven thousand, six hundred ninety-three".