665791424319 has 16 divisors (see below), whose sum is σ = 1014986516480. Its totient is φ = 380284541280.

The previous prime is 665791424299. The next prime is 665791424393. The reversal of 665791424319 is 913424197566.

665791424319 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665791424319 - 2⁸ = 665791424063 is a prime.

It is a super-2 number, since 2×665791424319² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665791424399) 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, 6938767 + ... + 7034064.

It is an arithmetic number, because the mean of its divisors is an integer number (63436657280).

Almost surely, 2^665791424319 is an apocalyptic number.

665791424319 is a deficient number, since it is larger than the sum of its proper divisors (349195092161).

665791424319 is a wasteful number, since it uses less digits than its factorization.

665791424319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13975110.

The product of its digits is 9797760, while the sum is 57.

The spelling of 665791424319 in words is "six hundred sixty-five billion, seven hundred ninety-one million, four hundred twenty-four thousand, three hundred nineteen".