645852134597 has 2 divisors, whose sum is σ = 645852134598. Its totient is φ = 645852134596.

The previous prime is 645852134479. The next prime is 645852134617. The reversal of 645852134597 is 795431258546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 487872913441 + 157979221156 = 698479^2 + 397466^2 .

It is a cyclic number.

It is not a de Polignac number, because 645852134597 - 2¹² = 645852130501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645852134197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322926067298 + 322926067299.

It is an arithmetic number, because the mean of its divisors is an integer number (322926067299).

Almost surely, 2^645852134597 is an apocalyptic number.

It is an amenable number.

645852134597 is a deficient number, since it is larger than the sum of its proper divisors (1).

645852134597 is an equidigital number, since it uses as much as digits as its factorization.

645852134597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36288000, while the sum is 59.

The spelling of 645852134597 in words is "six hundred forty-five billion, eight hundred fifty-two million, one hundred thirty-four thousand, five hundred ninety-seven".