645216632520223 has 2 divisors, whose sum is σ = 645216632520224. Its totient is φ = 645216632520222.

The previous prime is 645216632520211. The next prime is 645216632520311. The reversal of 645216632520223 is 322025236612546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645216632520223 - 2¹³ = 645216632512031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645216632520203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322608316260111 + 322608316260112.

It is an arithmetic number, because the mean of its divisors is an integer number (322608316260112).

Almost surely, 2^{645216632520223} is an apocalyptic number.

645216632520223 is a deficient number, since it is larger than the sum of its proper divisors (1).

645216632520223 is an equidigital number, since it uses as much as digits as its factorization.

645216632520223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6220800, while the sum is 49.

The spelling of 645216632520223 in words is "six hundred forty-five trillion, two hundred sixteen billion, six hundred thirty-two million, five hundred twenty thousand, two hundred twenty-three".