65920819 has 2 divisors, whose sum is σ = 65920820. Its totient is φ = 65920818.

The previous prime is 65920801. The next prime is 65920843. The reversal of 65920819 is 91802956.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 65920819 - 2⁹ = 65920307 is a prime.

It is a super-2 number, since 2×65920819² = 8691108755261522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65920859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32960409 + 32960410.

It is an arithmetic number, because the mean of its divisors is an integer number (32960410).

Almost surely, 2^65920819 is an apocalyptic number.

65920819 is a deficient number, since it is larger than the sum of its proper divisors (1).

65920819 is an equidigital number, since it uses as much as digits as its factorization.

65920819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 65920819 is about 8119.1636884595. The cubic root of 65920819 is about 403.9623265690.

The spelling of 65920819 in words is "sixty-five million, nine hundred twenty thousand, eight hundred nineteen".