65666065515 has 16 divisors (see below), whose sum is σ = 105242895648. Its totient is φ = 34962838016.

The previous prime is 65666065513. The next prime is 65666065537. The reversal of 65666065515 is 51556066656.

It is a cyclic number.

It is not a de Polignac number, because 65666065515 - 2¹ = 65666065513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65666065513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3682284 + ... + 3700073.

It is an arithmetic number, because the mean of its divisors is an integer number (6577680978).

Almost surely, 2^65666065515 is an apocalyptic number.

65666065515 is a deficient number, since it is larger than the sum of its proper divisors (39576830133).

65666065515 is a wasteful number, since it uses less digits than its factorization.

65666065515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7382958.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 65666065515 in words is "sixty-five billion, six hundred sixty-six million, sixty-five thousand, five hundred fifteen".