645043363 has 2 divisors, whose sum is σ = 645043364. Its totient is φ = 645043362.

The previous prime is 645043313. The next prime is 645043379. The reversal of 645043363 is 363340546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645043363 is a prime.

It is not a weakly prime, because it can be changed into another prime (645043313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322521681 + 322521682.

It is an arithmetic number, because the mean of its divisors is an integer number (322521682).

Almost surely, 2^645043363 is an apocalyptic number.

645043363 is a deficient number, since it is larger than the sum of its proper divisors (1).

645043363 is an equidigital number, since it uses as much as digits as its factorization.

645043363 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 34.

The square root of 645043363 is about 25397.7038922813. The cubic root of 645043363 is about 864.0316216957.

The spelling of 645043363 in words is "six hundred forty-five million, forty-three thousand, three hundred sixty-three".