75664691 has 2 divisors, whose sum is σ = 75664692. Its totient is φ = 75664690.

The previous prime is 75664681. The next prime is 75664747. The reversal of 75664691 is 19646657.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 75664691 - 2¹⁰ = 75663667 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75664681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37832345 + 37832346.

It is an arithmetic number, because the mean of its divisors is an integer number (37832346).

Almost surely, 2^75664691 is an apocalyptic number.

75664691 is a deficient number, since it is larger than the sum of its proper divisors (1).

75664691 is an equidigital number, since it uses as much as digits as its factorization.

75664691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 44.

The square root of 75664691 is about 8698.5453381586. The cubic root of 75664691 is about 422.9584971585.

The spelling of 75664691 in words is "seventy-five million, six hundred sixty-four thousand, six hundred ninety-one".