645446211003 has 24 divisors (see below), whose sum is σ = 1024830645696. Its totient is φ = 388193410800.

The previous prime is 645446211001. The next prime is 645446211023. The reversal of 645446211003 is 300112644546.

645446211003 is a `hidden beast` number, since 6 + 4 + 544 + 6 + 2 + 1 + 100 + 3 = 666.

It is not a de Polignac number, because 645446211003 - 2¹ = 645446211001 is a prime.

It is a super-2 number, since 2×645446211003² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645446211001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24871225 + ... + 24897162.

It is an arithmetic number, because the mean of its divisors is an integer number (42701276904).

Almost surely, 2^645446211003 is an apocalyptic number.

645446211003 is a deficient number, since it is larger than the sum of its proper divisors (379384434693).

645446211003 is a wasteful number, since it uses less digits than its factorization.

645446211003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49768535 (or 49768532 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

Adding to 645446211003 its reverse (300112644546), we get a palindrome (945558855549).

The spelling of 645446211003 in words is "six hundred forty-five billion, four hundred forty-six million, two hundred eleven thousand, three".