645100550012 has 12 divisors (see below), whose sum is σ = 1128947020656. Its totient is φ = 322544258400.

The previous prime is 645100550011. The next prime is 645100550041. The reversal of 645100550012 is 210055001546.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645100550011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1258448 + ... + 1695255.

It is an arithmetic number, because the mean of its divisors is an integer number (94078918388).

Almost surely, 2^645100550012 is an apocalyptic number.

It is an amenable number.

645100550012 is a deficient number, since it is larger than the sum of its proper divisors (483846470644).

645100550012 is a wasteful number, since it uses less digits than its factorization.

645100550012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3008308 (or 3008306 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 645100550012 its reverse (210055001546), we get a palindrome (855155551558).

The spelling of 645100550012 in words is "six hundred forty-five billion, one hundred million, five hundred fifty thousand, twelve".