645523560994032 has 240 divisors, whose sum is σ = 2156130813751200. Its totient is φ = 184373164846080.

The previous prime is 645523560994001. The next prime is 645523560994043. The reversal of 645523560994032 is 230499065325546.

It is a happy number.

645523560994032 is a `hidden beast` number, since 6 + 4 + 5 + 5 + 23 + 560 + 9 + 9 + 40 + 3 + 2 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 57712182 + ... + 67983402.

It is an arithmetic number, because the mean of its divisors is an integer number (8983878390630).

Almost surely, 2^{645523560994032} 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 645523560994032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1078065406875600).

645523560994032 is an abundant number, since it is smaller than the sum of its proper divisors (1510607252757168).

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

645523560994032 is a wasteful number, since it uses less digits than its factorization.

645523560994032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10274221 (or 10274202 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 63.

The spelling of 645523560994032 in words is "six hundred forty-five trillion, five hundred twenty-three billion, five hundred sixty million, nine hundred ninety-four thousand, thirty-two".