991645522603 has 2 divisors, whose sum is σ = 991645522604. Its totient is φ = 991645522602.

The previous prime is 991645522591. The next prime is 991645522607. The reversal of 991645522603 is 306225546199.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991645522603 is a prime.

It is not a weakly prime, because it can be changed into another prime (991645522607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495822761301 + 495822761302.

It is an arithmetic number, because the mean of its divisors is an integer number (495822761302).

Almost surely, 2^991645522603 is an apocalyptic number.

991645522603 is a deficient number, since it is larger than the sum of its proper divisors (1).

991645522603 is an equidigital number, since it uses as much as digits as its factorization.

991645522603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3499200, while the sum is 52.

The spelling of 991645522603 in words is "nine hundred ninety-one billion, six hundred forty-five million, five hundred twenty-two thousand, six hundred three".