80996665 has 4 divisors (see below), whose sum is σ = 97196004. Its totient is φ = 64797328.

The previous prime is 80996633. The next prime is 80996683. The reversal of 80996665 is 56669908.

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 25240576 + 55756089 = 5024^2 + 7467^2 .

It is a cyclic number.

It is not a de Polignac number, because 80996665 - 2⁵ = 80996633 is a prime.

It is a super-2 number, since 2×80996665² = 13120919482244450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8099662 + ... + 8099671.

It is an arithmetic number, because the mean of its divisors is an integer number (24299001).

Almost surely, 2^80996665 is an apocalyptic number.

It is an amenable number.

80996665 is a deficient number, since it is larger than the sum of its proper divisors (16199339).

80996665 is a wasteful number, since it uses less digits than its factorization.

80996665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16199338.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 80996665 is about 8999.8147203151. The cubic root of 80996665 is about 432.6689328597.

The spelling of 80996665 in words is "eighty million, nine hundred ninety-six thousand, six hundred sixty-five".