667688664533 has 16 divisors (see below), whose sum is σ = 729225369600. Its totient is φ = 606292015680.

The previous prime is 667688664449. The next prime is 667688664563. The reversal of 667688664533 is 335466886766.

It is a cyclic number.

It is not a de Polignac number, because 667688664533 - 2³⁶ = 598969187797 is a prime.

It is a super-2 number, since 2×667688664533² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667688664563) 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, 37107503 + ... + 37125491.

It is an arithmetic number, because the mean of its divisors is an integer number (45576585600).

Almost surely, 2^667688664533 is an apocalyptic number.

It is an amenable number.

667688664533 is a deficient number, since it is larger than the sum of its proper divisors (61536705067).

667688664533 is a wasteful number, since it uses less digits than its factorization.

667688664533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21692.

The product of its digits is 627056640, while the sum is 68.

The spelling of 667688664533 in words is "six hundred sixty-seven billion, six hundred eighty-eight million, six hundred sixty-four thousand, five hundred thirty-three".