65666411551 has 16 divisors (see below), whose sum is σ = 73239435360. Its totient is φ = 58458395520.

The previous prime is 65666411539. The next prime is 65666411599. The reversal of 65666411551 is 15511466656.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65666411551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65666411051) 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 in 15 ways as a sum of consecutive naturals, for example, 234261 + ... + 431521.

It is an arithmetic number, because the mean of its divisors is an integer number (4577464710).

Almost surely, 2^65666411551 is an apocalyptic number.

65666411551 is a deficient number, since it is larger than the sum of its proper divisors (7573023809).

65666411551 is a wasteful number, since it uses less digits than its factorization.

65666411551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198186.

The product of its digits is 648000, while the sum is 46.

The spelling of 65666411551 in words is "sixty-five billion, six hundred sixty-six million, four hundred eleven thousand, five hundred fifty-one".