667081 has 2 divisors, whose sum is σ = 667082. Its totient is φ = 667080.

The previous prime is 667021. The next prime is 667091. The reversal of 667081 is 180766.

667081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665856 + 1225 = 816^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 667081 - 2¹⁵ = 634313 is a prime.

It is a super-2 number, since 2×667081² = 889994121122, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

667081 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (667021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333540 + 333541.

It is an arithmetic number, because the mean of its divisors is an integer number (333541).

2⁶⁶⁷⁰⁸¹ is an apocalyptic number.

It is an amenable number.

667081 is a deficient number, since it is larger than the sum of its proper divisors (1).

667081 is an equidigital number, since it uses as much as digits as its factorization.

667081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 667081 is about 816.7502678298. The cubic root of 667081 is about 87.3761404010.

The spelling of 667081 in words is "six hundred sixty-seven thousand, eighty-one".