65944519617 has 8 divisors (see below), whose sum is σ = 88098770880. Its totient is φ = 43876640720.

The previous prime is 65944519601. The next prime is 65944519631. The reversal of 65944519617 is 71691544956.

It is a happy number.

65944519617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 65944519617 - 2⁴ = 65944519601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65944519687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21591309 + ... + 21594362.

It is an arithmetic number, because the mean of its divisors is an integer number (11012346360).

Almost surely, 2^65944519617 is an apocalyptic number.

It is an amenable number.

65944519617 is a deficient number, since it is larger than the sum of its proper divisors (22154251263).

65944519617 is a wasteful number, since it uses less digits than its factorization.

65944519617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43186183.

The product of its digits is 8164800, while the sum is 57.

The spelling of 65944519617 in words is "sixty-five billion, nine hundred forty-four million, five hundred nineteen thousand, six hundred seventeen".