645111002 has 24 divisors (see below), whose sum is σ = 1049851584. Its totient is φ = 297109952.

The previous prime is 645110989. The next prime is 645111007. The reversal of 645111002 is 200111546.

It is not an unprimeable number, because it can be changed into a prime (645111007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15293 + ... + 39039.

It is an arithmetic number, because the mean of its divisors is an integer number (43743816).

Almost surely, 2^645111002 is an apocalyptic number.

645111002 is a deficient number, since it is larger than the sum of its proper divisors (404740582).

645111002 is a wasteful number, since it uses less digits than its factorization.

645111002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23830 (or 23813 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 645111002 is about 25399.0354541270. The cubic root of 645111002 is about 864.0618213152.

Adding to 645111002 its reverse (200111546), we get a palindrome (845222548).

The spelling of 645111002 in words is "six hundred forty-five million, one hundred eleven thousand, two".