645264422431 has 2 divisors, whose sum is σ = 645264422432. Its totient is φ = 645264422430.

The previous prime is 645264422417. The next prime is 645264422441. The reversal of 645264422431 is 134224462546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645264422431 - 2¹³ = 645264414239 is a prime.

It is a super-2 number, since 2×645264422431² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645264422441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322632211215 + 322632211216.

It is an arithmetic number, because the mean of its divisors is an integer number (322632211216).

Almost surely, 2^645264422431 is an apocalyptic number.

645264422431 is a deficient number, since it is larger than the sum of its proper divisors (1).

645264422431 is an equidigital number, since it uses as much as digits as its factorization.

645264422431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1105920, while the sum is 43.

Adding to 645264422431 its reverse (134224462546), we get a palindrome (779488884977).

The spelling of 645264422431 in words is "six hundred forty-five billion, two hundred sixty-four million, four hundred twenty-two thousand, four hundred thirty-one".