645287189207 has 2 divisors, whose sum is σ = 645287189208. Its totient is φ = 645287189206.

The previous prime is 645287189203. The next prime is 645287189213. The reversal of 645287189207 is 702981782546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645287189207 - 2² = 645287189203 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645287189203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322643594603 + 322643594604.

It is an arithmetic number, because the mean of its divisors is an integer number (322643594604).

Almost surely, 2^645287189207 is an apocalyptic number.

645287189207 is a deficient number, since it is larger than the sum of its proper divisors (1).

645287189207 is an equidigital number, since it uses as much as digits as its factorization.

645287189207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13547520, while the sum is 59.

The spelling of 645287189207 in words is "six hundred forty-five billion, two hundred eighty-seven million, one hundred eighty-nine thousand, two hundred seven".