65989811 has 2 divisors, whose sum is σ = 65989812. Its totient is φ = 65989810.

The previous prime is 65989771. The next prime is 65989817. The reversal of 65989811 is 11898956.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65989811 - 2⁶ = 65989747 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65989817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32994905 + 32994906.

It is an arithmetic number, because the mean of its divisors is an integer number (32994906).

Almost surely, 2^65989811 is an apocalyptic number.

65989811 is a deficient number, since it is larger than the sum of its proper divisors (1).

65989811 is an equidigital number, since it uses as much as digits as its factorization.

65989811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 47.

The square root of 65989811 is about 8123.4112908310. The cubic root of 65989811 is about 404.1032049341.

The spelling of 65989811 in words is "sixty-five million, nine hundred eighty-nine thousand, eight hundred eleven".