99678195865 has 32 divisors (see below), whose sum is σ = 126624597120. Its totient is φ = 75117279744.

The previous prime is 99678195847. The next prime is 99678195887. The reversal of 99678195865 is 56859187699.

It is a 3-Lehmer number, since φ(99678195865) divides (99678195865-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 99678195865 - 2⁵ = 99678195833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20203939 + ... + 20208871.

It is an arithmetic number, because the mean of its divisors is an integer number (3957018660).

It is a Poulet number, since it divides 2^99678195864-1.

Almost surely, 2^99678195865 is an apocalyptic number.

99678195865 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

99678195865 is a deficient number, since it is larger than the sum of its proper divisors (26946401255).

99678195865 is a wasteful number, since it uses less digits than its factorization.

99678195865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6121.

The product of its digits is 293932800, while the sum is 73.

The spelling of 99678195865 in words is "ninety-nine billion, six hundred seventy-eight million, one hundred ninety-five thousand, eight hundred sixty-five".