645341823984 has 160 divisors (see below), whose sum is σ = 1974779106048. Its totient is φ = 180514963200.

The previous prime is 645341823977. The next prime is 645341823991. The reversal of 645341823984 is 489328143546.

It is an interprime number because it is at equal distance from previous prime (645341823977) and next prime (645341823991).

It is a congruent number.

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, 442039 + ... + 1219049.

Almost surely, 2^645341823984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645341823984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987389553024).

645341823984 is an abundant number, since it is smaller than the sum of its proper divisors (1329437282064).

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

645341823984 is a wasteful number, since it uses less digits than its factorization.

645341823984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777068 (or 777040 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 57.

The spelling of 645341823984 in words is "six hundred forty-five billion, three hundred forty-one million, eight hundred twenty-three thousand, nine hundred eighty-four".