65899999 has 16 divisors (see below), whose sum is σ = 76757760. Its totient is φ = 55944000.

The previous prime is 65899993. The next prime is 65900011. The reversal of 65899999 is 99999856.

It is a cyclic number.

It is not a de Polignac number, because 65899999 - 2¹³ = 65891807 is a prime.

It is a Duffinian number.

65899999 is a modest number, since divided by 9999 gives 6589 as remainder.

It is a zygodrome in base 5.

It is a self number, because there is not a number n which added to its sum of digits gives 65899999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65899993) 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, 12619 + ... + 17059.

It is an arithmetic number, because the mean of its divisors is an integer number (4797360).

Almost surely, 2^65899999 is an apocalyptic number.

65899999 is a deficient number, since it is larger than the sum of its proper divisors (10857761).

65899999 is a wasteful number, since it uses less digits than its factorization.

65899999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4542.

The product of its digits is 14171760, while the sum is 64.

The square root of 65899999 is about 8117.8814354485. The cubic root of 65899999 is about 403.9197938186.

The spelling of 65899999 in words is "sixty-five million, eight hundred ninety-nine thousand, nine hundred ninety-nine".