65531666616664 has 16 divisors (see below), whose sum is σ = 124352258942520. Its totient is φ = 32371064232000.

The previous prime is 65531666616569. The next prime is 65531666616697. The reversal of 65531666616664 is 46661666613556.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 65531666616664.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49346133837 + ... + 49346135164.

Almost surely, 2^{65531666616664} is an apocalyptic number.

It is an amenable number.

65531666616664 is a deficient number, since it is larger than the sum of its proper divisors (58820592325856).

65531666616664 is a wasteful number, since it uses less digits than its factorization.

65531666616664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98692269090 (or 98692269086 counting only the distinct ones).

The product of its digits is 503884800, while the sum is 67.

The spelling of 65531666616664 in words is "sixty-five trillion, five hundred thirty-one billion, six hundred sixty-six million, six hundred sixteen thousand, six hundred sixty-four".