645104563435332 has 480 divisors, whose sum is σ = 2273772964700160. Its totient is φ = 154023249703680.

The previous prime is 645104563435303. The next prime is 645104563435429. The reversal of 645104563435332 is 233534365401546.

It is a happy number.

645104563435332 is a `hidden beast` number, since 6 + 4 + 5 + 1 + 0 + 4 + 5 + 63 + 43 + 533 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 73352193 + ... + 81674679.

It is an arithmetic number, because the mean of its divisors is an integer number (4737027009792).

Almost surely, 2^{645104563435332} 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 645104563435332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1136886482350080).

645104563435332 is an abundant number, since it is smaller than the sum of its proper divisors (1628668401264828).

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

645104563435332 is a wasteful number, since it uses less digits than its factorization.

645104563435332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8322773 (or 8322762 counting only the distinct ones).

The product of its (nonzero) digits is 46656000, while the sum is 54.

The spelling of 645104563435332 in words is "six hundred forty-five trillion, one hundred four billion, five hundred sixty-three million, four hundred thirty-five thousand, three hundred thirty-two".