645325512405 has 64 divisors (see below), whose sum is σ = 1223035630080. Its totient is φ = 284399299584.

The previous prime is 645325512389. The next prime is 645325512413. The reversal of 645325512405 is 504215523546.

645325512405 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 645325512405 - 2⁴ = 645325512389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 338494 + ... + 1185423.

It is an arithmetic number, because the mean of its divisors is an integer number (19109931720).

Almost surely, 2^645325512405 is an apocalyptic number.

It is an amenable number.

645325512405 is a deficient number, since it is larger than the sum of its proper divisors (577710117675).

645325512405 is a wasteful number, since it uses less digits than its factorization.

645325512405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524078.

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 645325512405 in words is "six hundred forty-five billion, three hundred twenty-five million, five hundred twelve thousand, four hundred five".