645891052207 has 8 divisors (see below), whose sum is σ = 646562250000. Its totient is φ = 645220103424.

The previous prime is 645891052187. The next prime is 645891052277. The reversal of 645891052207 is 702250198546.

645891052207 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 a cyclic number.

It is not a de Polignac number, because 645891052207 - 2¹¹ = 645891050159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645891052277) 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, 5372448 + ... + 5491354.

It is an arithmetic number, because the mean of its divisors is an integer number (80820281250).

Almost surely, 2^645891052207 is an apocalyptic number.

645891052207 is a deficient number, since it is larger than the sum of its proper divisors (671197793).

645891052207 is a wasteful number, since it uses less digits than its factorization.

645891052207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124505.

The product of its (nonzero) digits is 1209600, while the sum is 49.

The spelling of 645891052207 in words is "six hundred forty-five billion, eight hundred ninety-one million, fifty-two thousand, two hundred seven".