65780393787 has 18 divisors (see below), whose sum is σ = 98541229332. Its totient is φ = 43850930472.

The previous prime is 65780393779. The next prime is 65780393813. The reversal of 65780393787 is 78739308756.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is not a de Polignac number, because 65780393787 - 2³ = 65780393779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65780393717) 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 17 ways as a sum of consecutive naturals, for example, 3989853 + ... + 4006305.

Almost surely, 2^65780393787 is an apocalyptic number.

65780393787 is a deficient number, since it is larger than the sum of its proper divisors (32760835545).

65780393787 is an frugal number, since it uses more digits than its factorization.

65780393787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32921 (or 16456 counting only the distinct ones).

The product of its (nonzero) digits is 53343360, while the sum is 63.

The spelling of 65780393787 in words is "sixty-five billion, seven hundred eighty million, three hundred ninety-three thousand, seven hundred eighty-seven".