9897851563 has 2 divisors, whose sum is σ = 9897851564. Its totient is φ = 9897851562.

The previous prime is 9897851543. The next prime is 9897851573. The reversal of 9897851563 is 3651587989.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9897851563 - 2⁵ = 9897851531 is a prime.

It is not a weakly prime, because it can be changed into another prime (9897851543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948925781 + 4948925782.

It is an arithmetic number, because the mean of its divisors is an integer number (4948925782).

Almost surely, 2^9897851563 is an apocalyptic number.

9897851563 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897851563 is an equidigital number, since it uses as much as digits as its factorization.

9897851563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16329600, while the sum is 61.

The square root of 9897851563 is about 99487.9468227182. The cubic root of 9897851563 is about 2147.0738316337.

The spelling of 9897851563 in words is "nine billion, eight hundred ninety-seven million, eight hundred fifty-one thousand, five hundred sixty-three".