645810390652 has 24 divisors (see below), whose sum is σ = 1293528678624. Its totient is φ = 276367046592.

The previous prime is 645810390649. The next prime is 645810390677. The reversal of 645810390652 is 256093018546.

645810390652 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645810390596 and 645810390605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17015503 + ... + 17053414.

It is an arithmetic number, because the mean of its divisors is an integer number (53897028276).

Almost surely, 2^645810390652 is an apocalyptic number.

It is an amenable number.

645810390652 is an abundant number, since it is smaller than the sum of its proper divisors (647718287972).

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

645810390652 is a wasteful number, since it uses less digits than its factorization.

645810390652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34069605 (or 34069603 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 645810390652 in words is "six hundred forty-five billion, eight hundred ten million, three hundred ninety thousand, six hundred fifty-two".