645312043013 has 16 divisors (see below), whose sum is σ = 704528616960. Its totient is φ = 586187679600.

The previous prime is 645312043009. The next prime is 645312043063. The reversal of 645312043013 is 310340213546.

It is a cyclic number.

It is not a de Polignac number, because 645312043013 - 2² = 645312043009 is a prime.

It is a super-2 number, since 2×645312043013² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645312043063) 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, 132477968 + ... + 132482838.

It is an arithmetic number, because the mean of its divisors is an integer number (44033038560).

Almost surely, 2^645312043013 is an apocalyptic number.

It is an amenable number.

645312043013 is a deficient number, since it is larger than the sum of its proper divisors (59216573947).

645312043013 is a wasteful number, since it uses less digits than its factorization.

645312043013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11848.

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 645312043013 its reverse (310340213546), we get a palindrome (955652256559).

The spelling of 645312043013 in words is "six hundred forty-five billion, three hundred twelve million, forty-three thousand, thirteen".