665812702783 has 4 divisors (see below), whose sum is σ = 666692244760. Its totient is φ = 664933160808.

The previous prime is 665812702759. The next prime is 665812702787. The reversal of 665812702783 is 387207218566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665812702783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665812702787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439769853 + ... + 439771366.

It is an arithmetic number, because the mean of its divisors is an integer number (166673061190).

Almost surely, 2^665812702783 is an apocalyptic number.

665812702783 is a deficient number, since it is larger than the sum of its proper divisors (879541977).

665812702783 is an equidigital number, since it uses as much as digits as its factorization.

665812702783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879541976.

The product of its (nonzero) digits is 6773760, while the sum is 55.

The spelling of 665812702783 in words is "six hundred sixty-five billion, eight hundred twelve million, seven hundred two thousand, seven hundred eighty-three".