65105819 has 2 divisors, whose sum is σ = 65105820. Its totient is φ = 65105818.

The previous prime is 65105813. The next prime is 65105839. The reversal of 65105819 is 91850156.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65105819 is a prime.

It is a super-2 number, since 2×65105819² = 8477535335321522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65105813) 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, 32552909 + 32552910.

It is an arithmetic number, because the mean of its divisors is an integer number (32552910).

Almost surely, 2^65105819 is an apocalyptic number.

65105819 is a deficient number, since it is larger than the sum of its proper divisors (1).

65105819 is an equidigital number, since it uses as much as digits as its factorization.

65105819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 65105819 is about 8068.8176953008. The cubic root of 65105819 is about 402.2906468855.

The spelling of 65105819 in words is "sixty-five million, one hundred five thousand, eight hundred nineteen".