80661009 has 16 divisors (see below), whose sum is σ = 126350784. Its totient is φ = 45124800.

The previous prime is 80660969. The next prime is 80661017. The reversal of 80661009 is 90016608.

It is not a de Polignac number, because 80661009 - 2¹¹ = 80658961 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (80661089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93582 + ... + 94439.

It is an arithmetic number, because the mean of its divisors is an integer number (7896924).

Almost surely, 2^80661009 is an apocalyptic number.

It is an amenable number.

80661009 is a deficient number, since it is larger than the sum of its proper divisors (45689775).

80661009 is a wasteful number, since it uses less digits than its factorization.

80661009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188048.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 80661009 is about 8981.1474211261. The cubic root of 80661009 is about 432.0704349746.

The spelling of 80661009 in words is "eighty million, six hundred sixty-one thousand, nine".