99666440 has 16 divisors (see below), whose sum is σ = 224249580. Its totient is φ = 39866560.

The previous prime is 99666407. The next prime is 99666443. The reversal of 99666440 is 4466699.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 96079204 + 3587236 = 9802^2 + 1894^2 .

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99666391 and 99666400.

It is not an unprimeable number, because it can be changed into a prime (99666443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1245791 + ... + 1245870.

Almost surely, 2^99666440 is an apocalyptic number.

It is an amenable number.

99666440 is an abundant number, since it is smaller than the sum of its proper divisors (124583140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99666440 is a wasteful number, since it uses less digits than its factorization.

99666440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491672 (or 2491668 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 99666440 is about 9983.3080689719. The cubic root of 99666440 is about 463.6422256899.

The spelling of 99666440 in words is "ninety-nine million, six hundred sixty-six thousand, four hundred forty".