80966857 has 2 divisors, whose sum is σ = 80966858. Its totient is φ = 80966856.

The previous prime is 80966839. The next prime is 80966861. The reversal of 80966857 is 75866908.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76370121 + 4596736 = 8739^2 + 2144^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80966857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80966857.

It is not a weakly prime, because it can be changed into another prime (80966357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40483428 + 40483429.

It is an arithmetic number, because the mean of its divisors is an integer number (40483429).

Almost surely, 2^80966857 is an apocalyptic number.

It is an amenable number.

80966857 is a deficient number, since it is larger than the sum of its proper divisors (1).

80966857 is an equidigital number, since it uses as much as digits as its factorization.

80966857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 80966857 is about 8998.1585338335. The cubic root of 80966857 is about 432.6158501064.

The spelling of 80966857 in words is "eighty million, nine hundred sixty-six thousand, eight hundred fifty-seven".