99920661 has 8 divisors (see below), whose sum is σ = 133284480. Its totient is φ = 66585312.

The previous prime is 99920659. The next prime is 99920663. The reversal of 99920661 is 16602999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99920659) and next prime (99920663).

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

It is not a de Polignac number, because 99920661 - 2¹ = 99920659 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99920663) 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, 3220 + ... + 14498.

It is an arithmetic number, because the mean of its divisors is an integer number (16660560).

Almost surely, 2^99920661 is an apocalyptic number.

It is an amenable number.

99920661 is a deficient number, since it is larger than the sum of its proper divisors (33363819).

99920661 is a wasteful number, since it uses less digits than its factorization.

99920661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14235.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 99920661 is about 9996.0322628531. The cubic root of 99920661 is about 464.0360978778.

The spelling of 99920661 in words is "ninety-nine million, nine hundred twenty thousand, six hundred sixty-one".