645624432100 has 36 divisors (see below), whose sum is σ = 1401696629424. Its totient is φ = 258122286880.

The previous prime is 645624432091. The next prime is 645624432121. The reversal of 645624432100 is 1234426546.

It is a self number, because there is not a number n which added to its sum of digits gives 645624432100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1389862 + ... + 1795261.

It is an arithmetic number, because the mean of its divisors is an integer number (38936017484).

Almost surely, 2^645624432100 is an apocalyptic number.

It is an amenable number.

645624432100 is an abundant number, since it is smaller than the sum of its proper divisors (756072197324).

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

645624432100 is a wasteful number, since it uses less digits than its factorization.

645624432100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187164 (or 3187157 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 645624432100 its reverse (1234426546), we get a palindrome (646858858646).

The spelling of 645624432100 in words is "six hundred forty-five billion, six hundred twenty-four million, four hundred thirty-two thousand, one hundred".