645245566005 has 16 divisors (see below), whose sum is σ = 1032569553600. Its totient is φ = 344072085888.

The previous prime is 645245566001. The next prime is 645245566019. The reversal of 645245566005 is 500665542546.

It is not a de Polignac number, because 645245566005 - 2² = 645245566001 is a prime.

It is a super-2 number, since 2×645245566005² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645245566001) 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, 3589507 + ... + 3764976.

It is an arithmetic number, because the mean of its divisors is an integer number (64535597100).

Almost surely, 2^645245566005 is an apocalyptic number.

It is an amenable number.

645245566005 is a deficient number, since it is larger than the sum of its proper divisors (387323987595).

645245566005 is a wasteful number, since it uses less digits than its factorization.

645245566005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7360340.

The product of its (nonzero) digits is 4320000, while the sum is 48.

The spelling of 645245566005 in words is "six hundred forty-five billion, two hundred forty-five million, five hundred sixty-six thousand, five".