99999978863 has 2 divisors, whose sum is σ = 99999978864. Its totient is φ = 99999978862.

The previous prime is 99999978853. The next prime is 99999978893. The reversal of 99999978863 is 36887999999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 99999978863 - 2⁸ = 99999978607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99999978803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999989431 + 49999989432.

It is an arithmetic number, because the mean of its divisors is an integer number (49999989432).

Almost surely, 2^99999978863 is an apocalyptic number.

99999978863 is a deficient number, since it is larger than the sum of its proper divisors (1).

99999978863 is an equidigital number, since it uses as much as digits as its factorization.

99999978863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4285540224, while the sum is 86.

The spelling of 99999978863 in words is "ninety-nine billion, nine hundred ninety-nine million, nine hundred seventy-eight thousand, eight hundred sixty-three".