645103021452 has 96 divisors (see below), whose sum is σ = 1637326236672. Its totient is φ = 196859206656.

The previous prime is 645103021439. The next prime is 645103021463. The reversal of 645103021452 is 254120301546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32016093 + ... + 32036235.

It is an arithmetic number, because the mean of its divisors is an integer number (17055481632).

Almost surely, 2^645103021452 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 645103021452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (818663118336).

645103021452 is an abundant number, since it is smaller than the sum of its proper divisors (992223215220).

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

645103021452 is a wasteful number, since it uses less digits than its factorization.

645103021452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24447 (or 24445 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 645103021452 its reverse (254120301546), we get a palindrome (899223322998).

The spelling of 645103021452 in words is "six hundred forty-five billion, one hundred three million, twenty-one thousand, four hundred fifty-two".