6691394533 has 2 divisors, whose sum is σ = 6691394534. Its totient is φ = 6691394532.

The previous prime is 6691394527. The next prime is 6691394539. The reversal of 6691394533 is 3354931966.

It is a balanced prime because it is at equal distance from previous prime (6691394527) and next prime (6691394539).

It can be written as a sum of positive squares in only one way, i.e., 5941018084 + 750376449 = 77078^2 + 27393^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691394533 - 2¹³ = 6691386341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691394539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345697266 + 3345697267.

It is an arithmetic number, because the mean of its divisors is an integer number (3345697267).

Almost surely, 2^6691394533 is an apocalyptic number.

It is an amenable number.

6691394533 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691394533 is an equidigital number, since it uses as much as digits as its factorization.

6691394533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 49.

The square root of 6691394533 is about 81800.9445727860. The cubic root of 6691394533 is about 1884.3961679256.

The spelling of 6691394533 in words is "six billion, six hundred ninety-one million, three hundred ninety-four thousand, five hundred thirty-three".