645251645012 has 24 divisors (see below), whose sum is σ = 1216206212256. Its totient is φ = 297770483808.

The previous prime is 645251644993. The next prime is 645251645033. The reversal of 645251645012 is 210546152546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377138 + ... + 1196969.

It is an arithmetic number, because the mean of its divisors is an integer number (50675258844).

Almost surely, 2^645251645012 is an apocalyptic number.

It is an amenable number.

645251645012 is a deficient number, since it is larger than the sum of its proper divisors (570954567244).

645251645012 is a wasteful number, since it uses less digits than its factorization.

645251645012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1582007 (or 1582005 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 41.

Adding to 645251645012 its reverse (210546152546), we get a palindrome (855797797558).

The spelling of 645251645012 in words is "six hundred forty-five billion, two hundred fifty-one million, six hundred forty-five thousand, twelve".