99776665 has 4 divisors (see below), whose sum is σ = 119732004. Its totient is φ = 79821328.

The previous prime is 99776659. The next prime is 99776669. The reversal of 99776665 is 56667799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18344089 + 81432576 = 4283^2 + 9024^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99776665 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99776669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9977662 + ... + 9977671.

It is an arithmetic number, because the mean of its divisors is an integer number (29933001).

Almost surely, 2^99776665 is an apocalyptic number.

It is an amenable number.

99776665 is a deficient number, since it is larger than the sum of its proper divisors (19955339).

99776665 is a wasteful number, since it uses less digits than its factorization.

99776665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19955338.

The product of its digits is 4286520, while the sum is 55.

The square root of 99776665 is about 9988.8270082127. The cubic root of 99776665 is about 463.8130827214.

The spelling of 99776665 in words is "ninety-nine million, seven hundred seventy-six thousand, six hundred sixty-five".