166862321 has 2 divisors, whose sum is σ = 166862322. Its totient is φ = 166862320.

The previous prime is 166862303. The next prime is 166862329. The reversal of 166862321 is 123268661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137007025 + 29855296 = 11705^2 + 5464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166862321 is a prime.

It is a Chen prime.

It is equal to p_9337274 and since 166862321 and 9337274 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (166862329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83431160 + 83431161.

It is an arithmetic number, because the mean of its divisors is an integer number (83431161).

Almost surely, 2^166862321 is an apocalyptic number.

It is an amenable number.

166862321 is a deficient number, since it is larger than the sum of its proper divisors (1).

166862321 is an equidigital number, since it uses as much as digits as its factorization.

166862321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 35.

The square root of 166862321 is about 12917.5199245056. The cubic root of 166862321 is about 550.5364693957.

The spelling of 166862321 in words is "one hundred sixty-six million, eight hundred sixty-two thousand, three hundred twenty-one".