211659161801 has 2 divisors, whose sum is σ = 211659161802. Its totient is φ = 211659161800.

The previous prime is 211659161797. The next prime is 211659161867. The reversal of 211659161801 is 108161956112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 116362854400 + 95296307401 = 341120^2 + 308701^2 .

It is a cyclic number.

It is not a de Polignac number, because 211659161801 - 2² = 211659161797 is a prime.

It is not a weakly prime, because it can be changed into another prime (211659163801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105829580900 + 105829580901.

It is an arithmetic number, because the mean of its divisors is an integer number (105829580901).

Almost surely, 2^211659161801 is an apocalyptic number.

It is an amenable number.

211659161801 is a deficient number, since it is larger than the sum of its proper divisors (1).

211659161801 is an equidigital number, since it uses as much as digits as its factorization.

211659161801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 41.

The spelling of 211659161801 in words is "two hundred eleven billion, six hundred fifty-nine million, one hundred sixty-one thousand, eight hundred one".