667666733773 has 4 divisors (see below), whose sum is σ = 719025713308. Its totient is φ = 616307754240.

The previous prime is 667666733711. The next prime is 667666733807. The reversal of 667666733773 is 377337666766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130116754089 + 537549979684 = 360717^2 + 733178^2 .

It is a cyclic number.

It is not a de Polignac number, because 667666733773 - 2²¹ = 667664636621 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 667666733699 and 667666733708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667666734773) 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, 25679489748 + ... + 25679489773.

It is an arithmetic number, because the mean of its divisors is an integer number (179756428327).

Almost surely, 2^667666733773 is an apocalyptic number.

It is an amenable number.

667666733773 is a deficient number, since it is larger than the sum of its proper divisors (51358979535).

667666733773 is a wasteful number, since it uses less digits than its factorization.

667666733773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51358979534.

The product of its digits is 504094752, while the sum is 67.

The spelling of 667666733773 in words is "six hundred sixty-seven billion, six hundred sixty-six million, seven hundred thirty-three thousand, seven hundred seventy-three".