65565998797 has 16 divisors (see below), whose sum is σ = 72413752320. Its totient is φ = 58986772992.

The previous prime is 65565998759. The next prime is 65565998809. The reversal of 65565998797 is 79789956556.

It is a cyclic number.

It is not a de Polignac number, because 65565998797 - 2¹⁹ = 65565474509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65565998737) 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, 78468 + ... + 370525.

It is an arithmetic number, because the mean of its divisors is an integer number (4525859520).

Almost surely, 2^65565998797 is an apocalyptic number.

It is an amenable number.

65565998797 is a deficient number, since it is larger than the sum of its proper divisors (6847753523).

65565998797 is a wasteful number, since it uses less digits than its factorization.

65565998797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449292.

The product of its digits is 1285956000, while the sum is 76.

The spelling of 65565998797 in words is "sixty-five billion, five hundred sixty-five million, nine hundred ninety-eight thousand, seven hundred ninety-seven".