667656533 has 2 divisors, whose sum is σ = 667656534. Its totient is φ = 667656532.

The previous prime is 667656503. The next prime is 667656553. The reversal of 667656533 is 335656766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 667602244 + 54289 = 25838^2 + 233^2 .

It is a cyclic number.

It is not a de Polignac number, because 667656533 - 2⁶ = 667656469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667656503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333828266 + 333828267.

It is an arithmetic number, because the mean of its divisors is an integer number (333828267).

Almost surely, 2^667656533 is an apocalyptic number.

It is an amenable number.

667656533 is a deficient number, since it is larger than the sum of its proper divisors (1).

667656533 is an equidigital number, since it uses as much as digits as its factorization.

667656533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 47.

The square root of 667656533 is about 25839.0505437023. The cubic root of 667656533 is about 874.0126148671.

The spelling of 667656533 in words is "six hundred sixty-seven million, six hundred fifty-six thousand, five hundred thirty-three".