645445202450100 has 72 divisors (see below), whose sum is σ = 2011141051338720. Its totient is φ = 158878819063680.

The previous prime is 645445202449969. The next prime is 645445202450123. The reversal of 645445202450100 is 1054202544546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82749381030 + ... + 82749388829.

Almost surely, 2^{645445202450100} is an apocalyptic number.

645445202450100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645445202450100 is an abundant number, since it is smaller than the sum of its proper divisors (1365695848888620).

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

645445202450100 is a wasteful number, since it uses less digits than its factorization.

645445202450100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165498769889 (or 165498769882 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 42.

Adding to 645445202450100 its reverse (1054202544546), we get a palindrome (646499404994646).

The spelling of 645445202450100 in words is "six hundred forty-five trillion, four hundred forty-five billion, two hundred two million, four hundred fifty thousand, one hundred".