99911666 has 4 divisors (see below), whose sum is σ = 149867502. Its totient is φ = 49955832.

The previous prime is 99911663. The next prime is 99911687. The reversal of 99911666 is 66611999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66611999 = 2383 ⋅27953.

It can be written as a sum of positive squares in only one way, i.e., 74459641 + 25452025 = 8629^2 + 5045^2 .

99911666 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99911666.

It is not an unprimeable number, because it can be changed into a prime (99911663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24977915 + ... + 24977918.

Almost surely, 2^99911666 is an apocalyptic number.

99911666 is a deficient number, since it is larger than the sum of its proper divisors (49955836).

99911666 is a wasteful number, since it uses less digits than its factorization.

99911666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49955835.

The product of its digits is 157464, while the sum is 47.

The square root of 99911666 is about 9995.5823242070. The cubic root of 99911666 is about 464.0221730635.

The spelling of 99911666 in words is "ninety-nine million, nine hundred eleven thousand, six hundred sixty-six".