645387750803 has 2 divisors, whose sum is σ = 645387750804. Its totient is φ = 645387750802.

The previous prime is 645387750767. The next prime is 645387750809. The reversal of 645387750803 is 308057783546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645387750803 - 2¹⁰ = 645387749779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (645387750809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322693875401 + 322693875402.

It is an arithmetic number, because the mean of its divisors is an integer number (322693875402).

Almost surely, 2^645387750803 is an apocalyptic number.

645387750803 is a deficient number, since it is larger than the sum of its proper divisors (1).

645387750803 is an equidigital number, since it uses as much as digits as its factorization.

645387750803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 645387750803 in words is "six hundred forty-five billion, three hundred eighty-seven million, seven hundred fifty thousand, eight hundred three".