65680018409 has 16 divisors (see below), whose sum is σ = 69929092800. Its totient is φ = 61589134656.

The previous prime is 65680018399. The next prime is 65680018433. The reversal of 65680018409 is 90481008656.

It is not a de Polignac number, because 65680018409 - 2¹² = 65680014313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65680018309) 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, 89234 + ... + 373259.

It is an arithmetic number, because the mean of its divisors is an integer number (4370568300).

Almost surely, 2^65680018409 is an apocalyptic number.

It is an amenable number.

65680018409 is a deficient number, since it is larger than the sum of its proper divisors (4249074391).

65680018409 is a wasteful number, since it uses less digits than its factorization.

65680018409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462664.

The product of its (nonzero) digits is 414720, while the sum is 47.

The spelling of 65680018409 in words is "sixty-five billion, six hundred eighty million, eighteen thousand, four hundred nine".