645632205 has 16 divisors (see below), whose sum is σ = 1093777344. Its totient is φ = 324081920.

The previous prime is 645632177. The next prime is 645632209. The reversal of 645632205 is 502236546.

It is not a de Polignac number, because 645632205 - 2⁸ = 645631949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645632209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1265691 + ... + 1266200.

It is an arithmetic number, because the mean of its divisors is an integer number (68361084).

Almost surely, 2^645632205 is an apocalyptic number.

It is an amenable number.

645632205 is a deficient number, since it is larger than the sum of its proper divisors (448145139).

645632205 is a wasteful number, since it uses less digits than its factorization.

645632205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2531916.

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 645632205 is about 25409.2936737722. The cubic root of 645632205 is about 864.2944584803.

The spelling of 645632205 in words is "six hundred forty-five million, six hundred thirty-two thousand, two hundred five".