65521811 has 2 divisors, whose sum is σ = 65521812. Its totient is φ = 65521810.

The previous prime is 65521789. The next prime is 65521837. The reversal of 65521811 is 11812556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65521811 - 2¹⁰ = 65520787 is a prime.

It is not a weakly prime, because it can be changed into another prime (65520811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32760905 + 32760906.

It is an arithmetic number, because the mean of its divisors is an integer number (32760906).

Almost surely, 2^65521811 is an apocalyptic number.

65521811 is a deficient number, since it is larger than the sum of its proper divisors (1).

65521811 is an equidigital number, since it uses as much as digits as its factorization.

65521811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2400, while the sum is 29.

The square root of 65521811 is about 8094.5544040423. The cubic root of 65521811 is about 403.1456371544.

The spelling of 65521811 in words is "sixty-five million, five hundred twenty-one thousand, eight hundred eleven".