667231535281 has 2 divisors, whose sum is σ = 667231535282. Its totient is φ = 667231535280.

The previous prime is 667231535233. The next prime is 667231535291. The reversal of 667231535281 is 182535132766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 530916249600 + 136315285681 = 728640^2 + 369209^2 .

It is a cyclic number.

It is not a de Polignac number, because 667231535281 - 2⁷ = 667231535153 is a prime.

It is a super-2 number, since 2×667231535281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667231535291) 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, 333615767640 + 333615767641.

It is an arithmetic number, because the mean of its divisors is an integer number (333615767641).

Almost surely, 2^667231535281 is an apocalyptic number.

It is an amenable number.

667231535281 is a deficient number, since it is larger than the sum of its proper divisors (1).

667231535281 is an equidigital number, since it uses as much as digits as its factorization.

667231535281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 49.

The spelling of 667231535281 in words is "six hundred sixty-seven billion, two hundred thirty-one million, five hundred thirty-five thousand, two hundred eighty-one".