645633064560 has 160 divisors (see below), whose sum is σ = 2183930219520. Its totient is φ = 156480076800.

The previous prime is 645633064513. The next prime is 645633064621. The reversal of 645633064560 is 65460336546.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12093606 + ... + 12146874.

It is an arithmetic number, because the mean of its divisors is an integer number (13649563872).

Almost surely, 2^645633064560 is an apocalyptic number.

645633064560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645633064560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1091965109760).

645633064560 is an abundant number, since it is smaller than the sum of its proper divisors (1538297154960).

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

645633064560 is a wasteful number, since it uses less digits than its factorization.

645633064560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57887 (or 57881 counting only the distinct ones).

The product of its (nonzero) digits is 4665600, while the sum is 48.

The spelling of 645633064560 in words is "six hundred forty-five billion, six hundred thirty-three million, sixty-four thousand, five hundred sixty".