667535081 has 2 divisors, whose sum is σ = 667535082. Its totient is φ = 667535080.

The previous prime is 667535051. The next prime is 667535087. The reversal of 667535081 is 180535766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 660027481 + 7507600 = 25691^2 + 2740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667535081 is a prime.

It is a super-2 number, since 2×667535081² = 891206168731353122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (667535087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333767540 + 333767541.

It is an arithmetic number, because the mean of its divisors is an integer number (333767541).

Almost surely, 2^667535081 is an apocalyptic number.

It is an amenable number.

667535081 is a deficient number, since it is larger than the sum of its proper divisors (1).

667535081 is an equidigital number, since it uses as much as digits as its factorization.

667535081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 667535081 is about 25836.7002730612. The cubic root of 667535081 is about 873.9596150526.

The spelling of 667535081 in words is "six hundred sixty-seven million, five hundred thirty-five thousand, eighty-one".