80765661 has 4 divisors (see below), whose sum is σ = 107687552. Its totient is φ = 53843772.

The previous prime is 80765611. The next prime is 80765681. The reversal of 80765661 is 16656708.

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 80765661 - 2¹⁹ = 80241373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80765611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13460941 + ... + 13460946.

It is an arithmetic number, because the mean of its divisors is an integer number (26921888).

Almost surely, 2^80765661 is an apocalyptic number.

It is an amenable number.

80765661 is a deficient number, since it is larger than the sum of its proper divisors (26921891).

80765661 is a wasteful number, since it uses less digits than its factorization.

80765661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26921890.

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 80765661 is about 8986.9717369089. The cubic root of 80765661 is about 432.2572145785.

The spelling of 80765661 in words is "eighty million, seven hundred sixty-five thousand, six hundred sixty-one".