645513655185 has 672 divisors, whose sum is σ = 1505463293952. Its totient is φ = 263834081280.

The previous prime is 645513655181. The next prime is 645513655261. The reversal of 645513655185 is 581556315546.

645513655185 is a `hidden beast` number, since 6 + 4 + 5 + 5 + 1 + 3 + 6 + 551 + 85 = 666.

645513655185 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645513655185 - 2² = 645513655181 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645513655181) by changing a digit.

It is a polite number, since it can be written in 671 ways as a sum of consecutive naturals, for example, 4711778437 + ... + 4711778573.

Almost surely, 2^645513655185 is an apocalyptic number.

It is an amenable number.

645513655185 is an abundant number, since it is smaller than the sum of its proper divisors (859949638767).

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

645513655185 is a wasteful number, since it uses less digits than its factorization.

645513655185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265 (or 243 counting only the distinct ones).

The product of its digits is 10800000, while the sum is 54.

The spelling of 645513655185 in words is "six hundred forty-five billion, five hundred thirteen million, six hundred fifty-five thousand, one hundred eighty-five".