645431125052 has 24 divisors (see below), whose sum is σ = 1320882304896. Its totient is φ = 270180470448.

The previous prime is 645431125051. The next prime is 645431125081. The reversal of 645431125052 is 250521134546.

It is a junction number, because it is equal to n+sod(n) for n = 645431124997 and 645431125015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645431125051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 268034978 + ... + 268037385.

It is an arithmetic number, because the mean of its divisors is an integer number (55036762704).

Almost surely, 2^645431125052 is an apocalyptic number.

It is an amenable number.

645431125052 is an abundant number, since it is smaller than the sum of its proper divisors (675451179844).

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

645431125052 is a wasteful number, since it uses less digits than its factorization.

645431125052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536072417 (or 536072415 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 645431125052 its reverse (250521134546), we get a palindrome (895952259598).

The spelling of 645431125052 in words is "six hundred forty-five billion, four hundred thirty-one million, one hundred twenty-five thousand, fifty-two".