645116473600 has 54 divisors (see below), whose sum is σ = 1596764087450. Its totient is φ = 258046586880.

The previous prime is 645116473493. The next prime is 645116473643. The reversal of 645116473600 is 6374611546.

It can be written as a sum of positive squares in 3 ways, for example, as 37165670656 + 607950802944 = 192784^2 + 779712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50393325 + ... + 50406124.

Almost surely, 2^645116473600 is an apocalyptic number.

It is an amenable number.

645116473600 is an abundant number, since it is smaller than the sum of its proper divisors (951647613850).

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

645116473600 is a wasteful number, since it uses less digits than its factorization.

645116473600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100799475 (or 100799456 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 43.

The spelling of 645116473600 in words is "six hundred forty-five billion, one hundred sixteen million, four hundred seventy-three thousand, six hundred".