645415040297 has 2 divisors, whose sum is σ = 645415040298. Its totient is φ = 645415040296.

The previous prime is 645415040243. The next prime is 645415040299. The reversal of 645415040297 is 792040514546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 563128675561 + 82286364736 = 750419^2 + 286856^2 .

It is a cyclic number.

It is not a de Polignac number, because 645415040297 - 2¹⁰ = 645415039273 is a prime.

Together with 645415040299, 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 (645415040299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322707520148 + 322707520149.

It is an arithmetic number, because the mean of its divisors is an integer number (322707520149).

Almost surely, 2^645415040297 is an apocalyptic number.

It is an amenable number.

645415040297 is a deficient number, since it is larger than the sum of its proper divisors (1).

645415040297 is an equidigital number, since it uses as much as digits as its factorization.

645415040297 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 645415040297 in words is "six hundred forty-five billion, four hundred fifteen million, forty thousand, two hundred ninety-seven".