643488884346 has 96 divisors (see below), whose sum is σ = 1661781708288. Its totient is φ = 161376425280.

The previous prime is 643488884329. The next prime is 643488884347.

643488884346 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is not an unprimeable number, because it can be changed into a prime (643488884347) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 439540 + ... + 1216623.

It is an arithmetic number, because the mean of its divisors is an integer number (17310226128).

Almost surely, 2^643488884346 is an apocalyptic number.

643488884346 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

643488884346 is an abundant number, since it is smaller than the sum of its proper divisors (1018292823942).

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

643488884346 is a wasteful number, since it uses less digits than its factorization.

643488884346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656244 (or 1656215 counting only the distinct ones).

The product of its digits is 339738624, while the sum is 66.

The spelling of 643488884346 in words is "six hundred forty-three billion, four hundred eighty-eight million, eight hundred eighty-four thousand, three hundred forty-six".