3995661811 has 2 divisors, whose sum is σ = 3995661812. Its totient is φ = 3995661810.

The previous prime is 3995661773. The next prime is 3995661841. The reversal of 3995661811 is 1181665993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3995661811 - 2¹¹ = 3995659763 is a prime.

It is not a weakly prime, because it can be changed into another prime (3995661841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997830905 + 1997830906.

It is an arithmetic number, because the mean of its divisors is an integer number (1997830906).

Almost surely, 2^3995661811 is an apocalyptic number.

3995661811 is a deficient number, since it is larger than the sum of its proper divisors (1).

3995661811 is an equidigital number, since it uses as much as digits as its factorization.

3995661811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 3995661811 is about 63211.2475039055. The cubic root of 3995661811 is about 1586.8269738980.

The spelling of 3995661811 in words is "three billion, nine hundred ninety-five million, six hundred sixty-one thousand, eight hundred eleven".