645411205 has 16 divisors (see below), whose sum is σ = 823198464. Its totient is φ = 484092160.

The previous prime is 645411199. The next prime is 645411233. The reversal of 645411205 is 502114546.

It is not a de Polignac number, because 645411205 - 2¹⁹ = 644886917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7920 + ... + 36790.

It is an arithmetic number, because the mean of its divisors is an integer number (51449904).

Almost surely, 2^645411205 is an apocalyptic number.

It is an amenable number.

645411205 is a deficient number, since it is larger than the sum of its proper divisors (177787259).

645411205 is a wasteful number, since it uses less digits than its factorization.

645411205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29156.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 645411205 is about 25404.9444990537. The cubic root of 645411205 is about 864.1958311854.

The spelling of 645411205 in words is "six hundred forty-five million, four hundred eleven thousand, two hundred five".