65997789 has 16 divisors (see below), whose sum is σ = 103381824. Its totient is φ = 36921600.

The previous prime is 65997779. The next prime is 65997793. The reversal of 65997789 is 98779956.

It is not a de Polignac number, because 65997789 - 2⁹ = 65997277 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65997719) 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, 76492 + ... + 77349.

It is an arithmetic number, because the mean of its divisors is an integer number (6461364).

Almost surely, 2^65997789 is an apocalyptic number.

It is an amenable number.

65997789 is a deficient number, since it is larger than the sum of its proper divisors (37384035).

65997789 is a wasteful number, since it uses less digits than its factorization.

65997789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153868.

The product of its digits is 8573040, while the sum is 60.

The square root of 65997789 is about 8123.9023258530. The cubic root of 65997789 is about 404.1194892938.

It can be divided in two parts, 659977 and 89, that added together give a palindrome (660066).

The spelling of 65997789 in words is "sixty-five million, nine hundred ninety-seven thousand, seven hundred eighty-nine".