645287189297 has 2 divisors, whose sum is σ = 645287189298. Its totient is φ = 645287189296.

The previous prime is 645287189279. The next prime is 645287189299. The reversal of 645287189297 is 792981782546.

645287189297 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (645287189279) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490050401296 + 155236788001 = 700036^2 + 394001^2 .

It is a cyclic number.

It is not a de Polignac number, because 645287189297 - 2¹² = 645287185201 is a prime.

It is a super-2 number, since 2×645287189297² (a number of 24 digits) contains 22 as substring.

Together with 645287189299, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645287189299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322643594648 + 322643594649.

It is an arithmetic number, because the mean of its divisors is an integer number (322643594649).

Almost surely, 2^645287189297 is an apocalyptic number.

It is an amenable number.

645287189297 is a deficient number, since it is larger than the sum of its proper divisors (1).

645287189297 is an equidigital number, since it uses as much as digits as its factorization.

645287189297 is an evil number, because the sum of its binary digits is even.

The product of its digits is 121927680, while the sum is 68.

The spelling of 645287189297 in words is "six hundred forty-five billion, two hundred eighty-seven million, one hundred eighty-nine thousand, two hundred ninety-seven".