645606555930 has 96 divisors (see below), whose sum is σ = 1938150998784. Its totient is φ = 146045887488.

The previous prime is 645606555929. The next prime is 645606556079. The reversal of 645606555930 is 39555606546.

645606555930 is a `hidden beast` number, since 6 + 4 + 56 + 0 + 6 + 5 + 559 + 30 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5221222 + ... + 5343441.

It is an arithmetic number, because the mean of its divisors is an integer number (20189072904).

Almost surely, 2^645606555930 is an apocalyptic number.

645606555930 is an abundant number, since it is smaller than the sum of its proper divisors (1292544442854).

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

645606555930 is a wasteful number, since it uses less digits than its factorization.

645606555930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10564780 (or 10564777 counting only the distinct ones).

The product of its (nonzero) digits is 14580000, while the sum is 54.

The spelling of 645606555930 in words is "six hundred forty-five billion, six hundred six million, five hundred fifty-five thousand, nine hundred thirty".