80447678689 has 9 divisors (see below), whose sum is σ = 93584303217. Its totient is φ = 68953451364.

The previous prime is 80447678677. The next prime is 80447678693. The reversal of 80447678689 is 98687674408.

The square root of 80447678689 is 283633.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 80447678689 - 2⁷ = 80447678561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80447678629) 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 8 ways as a sum of consecutive naturals, for example, 1965172 + ... + 2005690.

It is an arithmetic number, because the mean of its divisors is an integer number (10398255913).

Almost surely, 2^80447678689 is an apocalyptic number.

80447678689 is the 283633-rd square number.

80447678689 is the 141817-th centered octagonal number.

It is an amenable number.

80447678689 is a deficient number, since it is larger than the sum of its proper divisors (13136624528).

80447678689 is an frugal number, since it uses more digits than its factorization.

80447678689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81052 (or 40526 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 67.

The spelling of 80447678689 in words is "eighty billion, four hundred forty-seven million, six hundred seventy-eight thousand, six hundred eighty-nine".