99678195866 has 24 divisors (see below), whose sum is σ = 153335930580. Its totient is φ = 48596778752.

The previous prime is 99678195847. The next prime is 99678195887. The reversal of 99678195866 is 66859187699.

It can be written as a sum of positive squares in 2 ways, for example, as 76245015625 + 23433180241 = 276125^2 + 153079^2 .

It is a super-2 number, since 2×99678195866² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 99678195793 and 99678195802.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1146506 + ... + 1230378.

Almost surely, 2^99678195866 is an apocalyptic number.

99678195866 is a deficient number, since it is larger than the sum of its proper divisors (53657734714).

99678195866 is a wasteful number, since it uses less digits than its factorization.

99678195866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84238 (or 84191 counting only the distinct ones).

The product of its digits is 352719360, while the sum is 74.

The spelling of 99678195866 in words is "ninety-nine billion, six hundred seventy-eight million, one hundred ninety-five thousand, eight hundred sixty-six".