201686701691 has 2 divisors, whose sum is σ = 201686701692. Its totient is φ = 201686701690.

The previous prime is 201686701687. The next prime is 201686701709. The reversal of 201686701691 is 196107686102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201686701691 - 2² = 201686701687 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (201686709691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100843350845 + 100843350846.

It is an arithmetic number, because the mean of its divisors is an integer number (100843350846).

Almost surely, 2^201686701691 is an apocalyptic number.

201686701691 is a deficient number, since it is larger than the sum of its proper divisors (1).

201686701691 is an equidigital number, since it uses as much as digits as its factorization.

201686701691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 201686701691 in words is "two hundred one billion, six hundred eighty-six million, seven hundred one thousand, six hundred ninety-one".