80661943 has 4 divisors (see below), whose sum is σ = 84169008. Its totient is φ = 77154880.

The previous prime is 80661929. The next prime is 80661949. The reversal of 80661943 is 34916608.

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

It is a de Polignac number, because none of the positive numbers 2^k-80661943 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 (80661949) 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, 1753498 + ... + 1753543.

It is an arithmetic number, because the mean of its divisors is an integer number (21042252).

Almost surely, 2^80661943 is an apocalyptic number.

80661943 is a deficient number, since it is larger than the sum of its proper divisors (3507065).

80661943 is a wasteful number, since it uses less digits than its factorization.

80661943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3507064.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 80661943 is about 8981.1994187859. The cubic root of 80661943 is about 432.0721026627.

The spelling of 80661943 in words is "eighty million, six hundred sixty-one thousand, nine hundred forty-three".