645116551652 has 18 divisors (see below), whose sum is σ = 1180173052758. Its totient is φ = 308534001952.

The previous prime is 645116551609. The next prime is 645116551663. The reversal of 645116551652 is 256155611546.

645116551652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 487851959296 + 157264592356 = 698464^2 + 396566^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645116551597 and 645116551606.

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, 152435633 + ... + 152439864.

Almost surely, 2^645116551652 is an apocalyptic number.

It is an amenable number.

645116551652 is a deficient number, since it is larger than the sum of its proper divisors (535056501106).

645116551652 is a wasteful number, since it uses less digits than its factorization.

645116551652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304875547 (or 304875522 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 47.

The spelling of 645116551652 in words is "six hundred forty-five billion, one hundred sixteen million, five hundred fifty-one thousand, six hundred fifty-two".