645321325200 has 60 divisors (see below), whose sum is σ = 2067179315568. Its totient is φ = 172085686400.

The previous prime is 645321325141. The next prime is 645321325211. The reversal of 645321325200 is 2523123546.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (60).

It is a super-2 number, since 2×645321325200² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 268882686 + ... + 268885085.

Almost surely, 2^645321325200 is an apocalyptic number.

645321325200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645321325200 is an abundant number, since it is smaller than the sum of its proper divisors (1421857990368).

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

645321325200 is a wasteful number, since it uses less digits than its factorization.

645321325200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537767792 (or 537767781 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 645321325200 its reverse (2523123546), we get a palindrome (647844448746).

The spelling of 645321325200 in words is "six hundred forty-five billion, three hundred twenty-one million, three hundred twenty-five thousand, two hundred".