65939899 has 6 divisors (see below), whose sum is σ = 69593460. Its totient is φ = 62469036.

The previous prime is 65939891. The next prime is 65939903. The reversal of 65939899 is 99893956.

It is not a de Polignac number, because 65939899 - 2³ = 65939891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65939891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 90969 + ... + 91690.

It is an arithmetic number, because the mean of its divisors is an integer number (11598910).

Almost surely, 2^65939899 is an apocalyptic number.

65939899 is a deficient number, since it is larger than the sum of its proper divisors (3653561).

65939899 is a wasteful number, since it uses less digits than its factorization.

65939899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182697 (or 182678 counting only the distinct ones).

The product of its digits is 4723920, while the sum is 58.

The square root of 65939899 is about 8120.3386013146. The cubic root of 65939899 is about 404.0012968458.

The spelling of 65939899 in words is "sixty-five million, nine hundred thirty-nine thousand, eight hundred ninety-nine".