211660201651 has 2 divisors, whose sum is σ = 211660201652. Its totient is φ = 211660201650.

The previous prime is 211660201601. The next prime is 211660201703. The reversal of 211660201651 is 156102066112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 211660201651 - 2⁷ = 211660201523 is a prime.

It is not a weakly prime, because it can be changed into another prime (211660201601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105830100825 + 105830100826.

It is an arithmetic number, because the mean of its divisors is an integer number (105830100826).

Almost surely, 2^211660201651 is an apocalyptic number.

211660201651 is a deficient number, since it is larger than the sum of its proper divisors (1).

211660201651 is an equidigital number, since it uses as much as digits as its factorization.

211660201651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 211660201651 its reverse (156102066112), we get a palindrome (367762267763).

The spelling of 211660201651 in words is "two hundred eleven billion, six hundred sixty million, two hundred one thousand, six hundred fifty-one".