645509434212967 has 2 divisors, whose sum is σ = 645509434212968. Its totient is φ = 645509434212966.

The previous prime is 645509434212829. The next prime is 645509434213009. The reversal of 645509434212967 is 769212434905546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645509434212967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645509434212067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322754717106483 + 322754717106484.

It is an arithmetic number, because the mean of its divisors is an integer number (322754717106484).

Almost surely, 2^{645509434212967} is an apocalyptic number.

645509434212967 is a deficient number, since it is larger than the sum of its proper divisors (1).

645509434212967 is an equidigital number, since it uses as much as digits as its factorization.

645509434212967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 391910400, while the sum is 67.

The spelling of 645509434212967 in words is "six hundred forty-five trillion, five hundred nine billion, four hundred thirty-four million, two hundred twelve thousand, nine hundred sixty-seven".