65981611 has 2 divisors, whose sum is σ = 65981612. Its totient is φ = 65981610.

The previous prime is 65981581. The next prime is 65981627. The reversal of 65981611 is 11618956.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65981611 - 2⁵ = 65981579 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65901611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32990805 + 32990806.

It is an arithmetic number, because the mean of its divisors is an integer number (32990806).

Almost surely, 2^65981611 is an apocalyptic number.

65981611 is a deficient number, since it is larger than the sum of its proper divisors (1).

65981611 is an equidigital number, since it uses as much as digits as its factorization.

65981611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 37.

The square root of 65981611 is about 8122.9065610778. The cubic root of 65981611 is about 404.0864660695.

The spelling of 65981611 in words is "sixty-five million, nine hundred eighty-one thousand, six hundred eleven".