80971939585 has 8 divisors (see below), whose sum is σ = 98999654760. Its totient is φ = 63555333504.

The previous prime is 80971939577. The next prime is 80971939681. The reversal of 80971939585 is 58593917908.

It can be written as a sum of positive squares in 4 ways, for example, as 12365662401 + 68606277184 = 111201^2 + 261928^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80971939585 - 2³ = 80971939577 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152776980 + ... + 152777509.

It is an arithmetic number, because the mean of its divisors is an integer number (12374956845).

Almost surely, 2^80971939585 is an apocalyptic number.

It is an amenable number.

80971939585 is a deficient number, since it is larger than the sum of its proper divisors (18027715175).

80971939585 is a wasteful number, since it uses less digits than its factorization.

80971939585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305554547.

The product of its (nonzero) digits is 24494400, while the sum is 64.

The spelling of 80971939585 in words is "eighty billion, nine hundred seventy-one million, nine hundred thirty-nine thousand, five hundred eighty-five".