645522328239264 has 2880 divisors, whose sum is σ = 2396898938649600. Its totient is φ = 166701216153600.

The previous prime is 645522328239263. The next prime is 645522328239277. The reversal of 645522328239264 is 462932823225546.

645522328239264 is a `hidden beast` number, since 6 + 4 + 5 + 5 + 2 + 232 + 8 + 2 + 392 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (645522328239263) by changing a digit.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 1849634178162 + ... + 1849634178510.

It is an arithmetic number, because the mean of its divisors is an integer number (832256575920).

Almost surely, 2^{645522328239264} 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 645522328239264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198449469324800).

645522328239264 is an abundant number, since it is smaller than the sum of its proper divisors (1751376610410336).

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

645522328239264 is a wasteful number, since it uses less digits than its factorization.

645522328239264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585 (or 537 counting only the distinct ones).

The product of its digits is 298598400, while the sum is 63.

The spelling of 645522328239264 in words is "six hundred forty-five trillion, five hundred twenty-two billion, three hundred twenty-eight million, two hundred thirty-nine thousand, two hundred sixty-four".