99661111 has 8 divisors (see below), whose sum is σ = 108810000. Its totient is φ = 90527040.

The previous prime is 99661097. The next prime is 99661151. The reversal of 99661111 is 11116699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99661111 - 2⁷ = 99660983 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99661151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14115 + ... + 19963.

It is an arithmetic number, because the mean of its divisors is an integer number (13601250).

Almost surely, 2^99661111 is an apocalyptic number.

99661111 is a deficient number, since it is larger than the sum of its proper divisors (9148889).

99661111 is a wasteful number, since it uses less digits than its factorization.

99661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7409.

The product of its digits is 2916, while the sum is 34.

The square root of 99661111 is about 9983.0411699041. The cubic root of 99661111 is about 463.6339621478.

It can be divided in two parts, 996611 and 11, that multiplied together give a square (10962721 = 3311²).

The spelling of 99661111 in words is "ninety-nine million, six hundred sixty-one thousand, one hundred eleven".