It is a semiprime because it is the product of two primes.
99611966 is a strobogrammatic number because it is the same when read upside-down.
It is a self number, because there is not a number n which added to its sum of digits gives 99611966.
It is a congruent number.
It is an unprimeable number.
Almost surely, 299611966 is an apocalyptic number.
99611966 is a wasteful number, since it uses less digits than its factorization.
99611966 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 49805985.
The square root of 99611966 is about 9980.5794420965. The cubic root of 99611966 is about 463.5577403826.
The spelling of 99611966 in words is "ninety-nine million, six hundred eleven thousand, nine hundred sixty-six".