643658531167 has 8 divisors (see below), whose sum is σ = 674430593760. Its totient is φ = 613118711040.

The previous prime is 643658531161. The next prime is 643658531251. The reversal of 643658531167 is 761135856346.

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

It is a cyclic number.

It is not a de Polignac number, because 643658531167 - 2⁷ = 643658531039 is a prime.

It is a super-3 number, since 3×643658531167³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643658531161) 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, 58054942 + ... + 58066027.

It is an arithmetic number, because the mean of its divisors is an integer number (84303824220).

Almost surely, 2^643658531167 is an apocalyptic number.

643658531167 is a deficient number, since it is larger than the sum of its proper divisors (30772062593).

643658531167 is a wasteful number, since it uses less digits than its factorization.

643658531167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116121233.

The product of its digits is 10886400, while the sum is 55.

The spelling of 643658531167 in words is "six hundred forty-three billion, six hundred fifty-eight million, five hundred thirty-one thousand, one hundred sixty-seven".