167221318707281 has 2 divisors, whose sum is σ = 167221318707282. Its totient is φ = 167221318707280.

The previous prime is 167221318707263. The next prime is 167221318707299. The reversal of 167221318707281 is 182707813122761.

It is a balanced prime because it is at equal distance from previous prime (167221318707263) and next prime (167221318707299).

It can be written as a sum of positive squares in only one way, i.e., 123333462913600 + 43887855793681 = 11105560^2 + 6624791^2 .

It is a cyclic number.

It is not a de Polignac number, because 167221318707281 - 2⁶ = 167221318707217 is a prime.

It is a super-2 number, since 2×167221318707281² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (167221318703281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83610659353640 + 83610659353641.

It is an arithmetic number, because the mean of its divisors is an integer number (83610659353641).

Almost surely, 2^{167221318707281} is an apocalyptic number.

It is an amenable number.

167221318707281 is a deficient number, since it is larger than the sum of its proper divisors (1).

167221318707281 is an equidigital number, since it uses as much as digits as its factorization.

167221318707281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3161088, while the sum is 56.

The spelling of 167221318707281 in words is "one hundred sixty-seven trillion, two hundred twenty-one billion, three hundred eighteen million, seven hundred seven thousand, two hundred eighty-one".