801611805691 has 2 divisors, whose sum is σ = 801611805692. Its totient is φ = 801611805690.

The previous prime is 801611805677. The next prime is 801611805739. The reversal of 801611805691 is 196508116108.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 801611805691 - 2⁹ = 801611805179 is a prime.

It is not a weakly prime, because it can be changed into another prime (801611805671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400805902845 + 400805902846.

It is an arithmetic number, because the mean of its divisors is an integer number (400805902846).

Almost surely, 2^801611805691 is an apocalyptic number.

801611805691 is a deficient number, since it is larger than the sum of its proper divisors (1).

801611805691 is an equidigital number, since it uses as much as digits as its factorization.

801611805691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 46.

The spelling of 801611805691 in words is "eight hundred one billion, six hundred eleven million, eight hundred five thousand, six hundred ninety-one".