65161619 has 2 divisors, whose sum is σ = 65161620. Its totient is φ = 65161618.

The previous prime is 65161589. The next prime is 65161633. The reversal of 65161619 is 91616156.

65161619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65161619 is a prime.

It is a super-2 number, since 2×65161619² = 8492073181402322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65161519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32580809 + 32580810.

It is an arithmetic number, because the mean of its divisors is an integer number (32580810).

Almost surely, 2^65161619 is an apocalyptic number.

65161619 is a deficient number, since it is larger than the sum of its proper divisors (1).

65161619 is an equidigital number, since it uses as much as digits as its factorization.

65161619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 65161619 is about 8072.2747103899. The cubic root of 65161619 is about 402.4055439787.

The spelling of 65161619 in words is "sixty-five million, one hundred sixty-one thousand, six hundred nineteen".