645665195 has 8 divisors (see below), whose sum is σ = 885483744. Its totient is φ = 442741824.

The previous prime is 645665159. The next prime is 645665197. The reversal of 645665195 is 591566546.

645665195 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 645665195 - 2¹² = 645661099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645665197) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9223754 + ... + 9223823.

It is an arithmetic number, because the mean of its divisors is an integer number (110685468).

Almost surely, 2^645665195 is an apocalyptic number.

645665195 is a deficient number, since it is larger than the sum of its proper divisors (239818549).

645665195 is a wasteful number, since it uses less digits than its factorization.

645665195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18447589.

The product of its digits is 972000, while the sum is 47.

The square root of 645665195 is about 25409.9428374013. The cubic root of 645665195 is about 864.3091792394.

The spelling of 645665195 in words is "six hundred forty-five million, six hundred sixty-five thousand, one hundred ninety-five".