80666321 has 2 divisors, whose sum is σ = 80666322. Its totient is φ = 80666320.

The previous prime is 80666303. The next prime is 80666329. The reversal of 80666321 is 12366608.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80640400 + 25921 = 8980^2 + 161^2 .

It is a cyclic number.

It is not a de Polignac number, because 80666321 - 2²⁶ = 13557457 is a prime.

It is not a weakly prime, because it can be changed into another prime (80666329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40333160 + 40333161.

It is an arithmetic number, because the mean of its divisors is an integer number (40333161).

Almost surely, 2^80666321 is an apocalyptic number.

It is an amenable number.

80666321 is a deficient number, since it is larger than the sum of its proper divisors (1).

80666321 is an equidigital number, since it uses as much as digits as its factorization.

80666321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 80666321 is about 8981.4431468445. The cubic root of 80666321 is about 432.0799195562.

The spelling of 80666321 in words is "eighty million, six hundred sixty-six thousand, three hundred twenty-one".