99678195887 has 2 divisors, whose sum is σ = 99678195888. Its totient is φ = 99678195886.

The previous prime is 99678195847. The next prime is 99678195893. The reversal of 99678195887 is 78859187699.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 99678195887 - 2¹² = 99678191791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99678195817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49839097943 + 49839097944.

It is an arithmetic number, because the mean of its divisors is an integer number (49839097944).

Almost surely, 2^99678195887 is an apocalyptic number.

99678195887 is a deficient number, since it is larger than the sum of its proper divisors (1).

99678195887 is an equidigital number, since it uses as much as digits as its factorization.

99678195887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 548674560, while the sum is 77.

The spelling of 99678195887 in words is "ninety-nine billion, six hundred seventy-eight million, one hundred ninety-five thousand, eight hundred eighty-seven".