645332004252 has 36 divisors (see below), whose sum is σ = 1756737123960. Its totient is φ = 198563693472.

The previous prime is 645332004241. The next prime is 645332004259. The reversal of 645332004252 is 252400233546.

645332004252 is a `hidden beast` number, since 64 + 533 + 20 + 0 + 42 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645332004259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 689456802 + ... + 689457737.

Almost surely, 2^645332004252 is an apocalyptic number.

It is an amenable number.

645332004252 is an abundant number, since it is smaller than the sum of its proper divisors (1111405119708).

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

645332004252 is a wasteful number, since it uses less digits than its factorization.

645332004252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378914562 (or 1378914557 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

Adding to 645332004252 its reverse (252400233546), we get a palindrome (897732237798).

The spelling of 645332004252 in words is "six hundred forty-five billion, three hundred thirty-two million, four thousand, two hundred fifty-two".