643173371346 has 64 divisors (see below), whose sum is σ = 1407994638336. Its totient is φ = 194247820800.

The previous prime is 643173371339. The next prime is 643173371381.

643173371346 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×643173371346² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 643173371295 and 643173371304.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 53276491 + ... + 53288561.

It is an arithmetic number, because the mean of its divisors is an integer number (21999916224).

Almost surely, 2^643173371346 is an apocalyptic number.

643173371346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

643173371346 is an abundant number, since it is smaller than the sum of its proper divisors (764821266990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643173371346 is a wasteful number, since it uses less digits than its factorization.

643173371346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14727.

The product of its digits is 2286144, while the sum is 48.

The spelling of 643173371346 in words is "six hundred forty-three billion, one hundred seventy-three million, three hundred seventy-one thousand, three hundred forty-six".