645301403623 has 2 divisors, whose sum is σ = 645301403624. Its totient is φ = 645301403622.

The previous prime is 645301403531. The next prime is 645301403627. The reversal of 645301403623 is 326304103546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645301403623 - 2⁹ = 645301403111 is a prime.

It is a super-2 number, since 2×645301403623² (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 (645301403627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322650701811 + 322650701812.

It is an arithmetic number, because the mean of its divisors is an integer number (322650701812).

Almost surely, 2^645301403623 is an apocalyptic number.

645301403623 is a deficient number, since it is larger than the sum of its proper divisors (1).

645301403623 is an equidigital number, since it uses as much as digits as its factorization.

645301403623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 37.

The spelling of 645301403623 in words is "six hundred forty-five billion, three hundred one million, four hundred three thousand, six hundred twenty-three".