645552515303 has 2 divisors, whose sum is σ = 645552515304. Its totient is φ = 645552515302.

The previous prime is 645552515281. The next prime is 645552515317. The reversal of 645552515303 is 303515255546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645552515303 - 2¹² = 645552511207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645552515383) 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, 322776257651 + 322776257652.

It is an arithmetic number, because the mean of its divisors is an integer number (322776257652).

Almost surely, 2^645552515303 is an apocalyptic number.

645552515303 is a deficient number, since it is larger than the sum of its proper divisors (1).

645552515303 is an equidigital number, since it uses as much as digits as its factorization.

645552515303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350000, while the sum is 44.

The spelling of 645552515303 in words is "six hundred forty-five billion, five hundred fifty-two million, five hundred fifteen thousand, three hundred three".