645245444605 has 8 divisors (see below), whose sum is σ = 774358371072. Its totient is φ = 516153797328.

The previous prime is 645245444567. The next prime is 645245444609. The reversal of 645245444605 is 506444542546.

645245444605 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 645245444605 - 2¹¹ = 645245442557 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 (645245444609) 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, 5253009 + ... + 5374438.

It is an arithmetic number, because the mean of its divisors is an integer number (96794796384).

Almost surely, 2^645245444605 is an apocalyptic number.

It is an amenable number.

645245444605 is a deficient number, since it is larger than the sum of its proper divisors (129112926467).

645245444605 is a wasteful number, since it uses less digits than its factorization.

645245444605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10639595.

The product of its (nonzero) digits is 9216000, while the sum is 49.

The spelling of 645245444605 in words is "six hundred forty-five billion, two hundred forty-five million, four hundred forty-four thousand, six hundred five".