645322440053 has 2 divisors, whose sum is σ = 645322440054. Its totient is φ = 645322440052.

The previous prime is 645322440013. The next prime is 645322440067. The reversal of 645322440053 is 350044223546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 470783982769 + 174538457284 = 686137^2 + 417778^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645322440053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645322439989 and 645322440016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645322440013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322661220026 + 322661220027.

It is an arithmetic number, because the mean of its divisors is an integer number (322661220027).

Almost surely, 2^645322440053 is an apocalyptic number.

It is an amenable number.

645322440053 is a deficient number, since it is larger than the sum of its proper divisors (1).

645322440053 is an equidigital number, since it uses as much as digits as its factorization.

645322440053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 345600, while the sum is 38.

Adding to 645322440053 its reverse (350044223546), we get a palindrome (995366663599).

The spelling of 645322440053 in words is "six hundred forty-five billion, three hundred twenty-two million, four hundred forty thousand, fifty-three".