7643166691 has 2 divisors, whose sum is σ = 7643166692. Its totient is φ = 7643166690.

The previous prime is 7643166683. The next prime is 7643166733. The reversal of 7643166691 is 1966613467.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7643166691 - 2³ = 7643166683 is a prime.

It is not a weakly prime, because it can be changed into another prime (7643166611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3821583345 + 3821583346.

It is an arithmetic number, because the mean of its divisors is an integer number (3821583346).

Almost surely, 2^7643166691 is an apocalyptic number.

7643166691 is a deficient number, since it is larger than the sum of its proper divisors (1).

7643166691 is an equidigital number, since it uses as much as digits as its factorization.

7643166691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 49.

The square root of 7643166691 is about 87425.2062679866. The cubic root of 7643166691 is about 1969.8104802780.

The spelling of 7643166691 in words is "seven billion, six hundred forty-three million, one hundred sixty-six thousand, six hundred ninety-one".