645342505 has 16 divisors (see below), whose sum is σ = 816148800. Its totient is φ = 488514240.

The previous prime is 645342463. The next prime is 645342521. The reversal of 645342505 is 505243546.

645342505 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 645342505 - 2⁹ = 645341993 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85786 + ... + 93004.

It is an arithmetic number, because the mean of its divisors is an integer number (51009300).

Almost surely, 2^645342505 is an apocalyptic number.

It is an amenable number.

645342505 is a deficient number, since it is larger than the sum of its proper divisors (170806295).

645342505 is a wasteful number, since it uses less digits than its factorization.

645342505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8184.

The product of its (nonzero) digits is 72000, while the sum is 34.

The square root of 645342505 is about 25403.5923640732. The cubic root of 645342505 is about 864.1651673441.

The spelling of 645342505 in words is "six hundred forty-five million, three hundred forty-two thousand, five hundred five".