645552485952 has 168 divisors, whose sum is σ = 1912841699328. Its totient is φ = 191930618880.

The previous prime is 645552485839. The next prime is 645552485969. The reversal of 645552485952 is 259584255546.

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 23 ways as a sum of consecutive naturals, for example, 969153 + ... + 1493439.

It is an arithmetic number, because the mean of its divisors is an integer number (11385962496).

Almost surely, 2^645552485952 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 645552485952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956420849664).

645552485952 is an abundant number, since it is smaller than the sum of its proper divisors (1267289213376).

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

645552485952 is a wasteful number, since it uses less digits than its factorization.

645552485952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524377 (or 524356 counting only the distinct ones).

The product of its digits is 86400000, while the sum is 60.

The spelling of 645552485952 in words is "six hundred forty-five billion, five hundred fifty-two million, four hundred eighty-five thousand, nine hundred fifty-two".