645053603 has 2 divisors, whose sum is σ = 645053604. Its totient is φ = 645053602.

The previous prime is 645053573. The next prime is 645053639. The reversal of 645053603 is 306350546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645053603 - 2²² = 640859299 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645053603.

It is not a weakly prime, because it can be changed into another prime (645053663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322526801 + 322526802.

It is an arithmetic number, because the mean of its divisors is an integer number (322526802).

Almost surely, 2^645053603 is an apocalyptic number.

645053603 is a deficient number, since it is larger than the sum of its proper divisors (1).

645053603 is an equidigital number, since it uses as much as digits as its factorization.

645053603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 32.

The square root of 645053603 is about 25397.9054845080. The cubic root of 645053603 is about 864.0361938106.

The spelling of 645053603 in words is "six hundred forty-five million, fifty-three thousand, six hundred three".