99666664 has 8 divisors (see below), whose sum is σ = 186875010. Its totient is φ = 49833328.

The previous prime is 99666661. The next prime is 99666667. The reversal of 99666664 is 46666699.

It is an interprime number because it is at equal distance from previous prime (99666661) and next prime (99666667).

It can be written as a sum of positive squares in only one way, i.e., 68194564 + 31472100 = 8258^2 + 5610^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99666661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6229159 + ... + 6229174.

Almost surely, 2^99666664 is an apocalyptic number.

It is an amenable number.

99666664 is a deficient number, since it is larger than the sum of its proper divisors (87208346).

99666664 is a wasteful number, since it uses less digits than its factorization.

99666664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12458339 (or 12458335 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 52.

The square root of 99666664 is about 9983.3192876918. The cubic root of 99666664 is about 463.6425730344.

The spelling of 99666664 in words is "ninety-nine million, six hundred sixty-six thousand, six hundred sixty-four".