196662757691 has 2 divisors, whose sum is σ = 196662757692. Its totient is φ = 196662757690.

The previous prime is 196662757649. The next prime is 196662757699. The reversal of 196662757691 is 196757266691.

It is a strong prime.

It is an emirp because it is prime and its reverse (196757266691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-196662757691 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (196662757699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98331378845 + 98331378846.

It is an arithmetic number, because the mean of its divisors is an integer number (98331378846).

Almost surely, 2^196662757691 is an apocalyptic number.

196662757691 is a deficient number, since it is larger than the sum of its proper divisors (1).

196662757691 is an equidigital number, since it uses as much as digits as its factorization.

196662757691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51438240, while the sum is 65.

The spelling of 196662757691 in words is "one hundred ninety-six billion, six hundred sixty-two million, seven hundred fifty-seven thousand, six hundred ninety-one".