5263645991 has 2 divisors, whose sum is σ = 5263645992. Its totient is φ = 5263645990.

The previous prime is 5263645987. The next prime is 5263645997. The reversal of 5263645991 is 1995463625.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5263645991 - 2² = 5263645987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5263645997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631822995 + 2631822996.

It is an arithmetic number, because the mean of its divisors is an integer number (2631822996).

Almost surely, 2^5263645991 is an apocalyptic number.

5263645991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5263645991 is an equidigital number, since it uses as much as digits as its factorization.

5263645991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1749600, while the sum is 50.

The square root of 5263645991 is about 72550.9889043561. The cubic root of 5263645991 is about 1739.5178554690.

The spelling of 5263645991 in words is "five billion, two hundred sixty-three million, six hundred forty-five thousand, nine hundred ninety-one".