65780799 has 16 divisors (see below), whose sum is σ = 100843008. Its totient is φ = 37361952.

The previous prime is 65780797. The next prime is 65780809. The reversal of 65780799 is 99708756.

It is not a de Polignac number, because 65780799 - 2¹ = 65780797 is a prime.

It is a super-2 number, since 2×65780799² = 8654227034156802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65780797) 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, 5872 + ... + 12885.

It is an arithmetic number, because the mean of its divisors is an integer number (6302688).

Almost surely, 2^65780799 is an apocalyptic number.

65780799 is a deficient number, since it is larger than the sum of its proper divisors (35062209).

65780799 is a wasteful number, since it uses less digits than its factorization.

65780799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18934.

The product of its (nonzero) digits is 952560, while the sum is 51.

The square root of 65780799 is about 8110.5362954616. The cubic root of 65780799 is about 403.6761099594.

The spelling of 65780799 in words is "sixty-five million, seven hundred eighty thousand, seven hundred ninety-nine".