80207661 has 4 divisors (see below), whose sum is σ = 106943552. Its totient is φ = 53471772.

The previous prime is 80207639. The next prime is 80207663. The reversal of 80207661 is 16670208.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 80207661 - 2⁵ = 80207629 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80207663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13367941 + ... + 13367946.

It is an arithmetic number, because the mean of its divisors is an integer number (26735888).

Almost surely, 2^80207661 is an apocalyptic number.

It is an amenable number.

80207661 is a deficient number, since it is larger than the sum of its proper divisors (26735891).

80207661 is a wasteful number, since it uses less digits than its factorization.

80207661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26735890.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 80207661 is about 8955.8729892736. The cubic root of 80207661 is about 431.2594425994.

Adding to 80207661 its reverse (16670208), we get a palindrome (96877869).

The spelling of 80207661 in words is "eighty million, two hundred seven thousand, six hundred sixty-one".