645321203049599 has 2 divisors, whose sum is σ = 645321203049600. Its totient is φ = 645321203049598.

The previous prime is 645321203049583. The next prime is 645321203049647. The reversal of 645321203049599 is 995940302123546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645321203049599 - 2⁴ = 645321203049583 is a prime.

It is a super-3 number, since 3×645321203049599³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645321203043599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322660601524799 + 322660601524800.

It is an arithmetic number, because the mean of its divisors is an integer number (322660601524800).

Almost surely, 2^{645321203049599} is an apocalyptic number.

645321203049599 is a deficient number, since it is larger than the sum of its proper divisors (1).

645321203049599 is an equidigital number, since it uses as much as digits as its factorization.

645321203049599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62985600, while the sum is 62.

The spelling of 645321203049599 in words is "six hundred forty-five trillion, three hundred twenty-one billion, two hundred three million, forty-nine thousand, five hundred ninety-nine".