667667312969 has 8 divisors (see below), whose sum is σ = 691636737960. Its totient is φ = 644063833600.

The previous prime is 667667312953. The next prime is 667667312989. The reversal of 667667312969 is 969213766766.

It can be written as a sum of positive squares in 4 ways, for example, as 17007289744 + 650660023225 = 130412^2 + 806635^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667667312969 - 2⁴ = 667667312953 is a prime.

It is a super-2 number, since 2×667667312969² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667667312899 and 667667312908.

It is not an unprimeable number, because it can be changed into a prime (667667312989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91482692 + ... + 91489989.

It is an arithmetic number, because the mean of its divisors is an integer number (86454592245).

Almost surely, 2^667667312969 is an apocalyptic number.

It is an amenable number.

667667312969 is a deficient number, since it is larger than the sum of its proper divisors (23969424991).

667667312969 is a wasteful number, since it uses less digits than its factorization.

667667312969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182972811.

The product of its digits is 185177664, while the sum is 68.

The spelling of 667667312969 in words is "six hundred sixty-seven billion, six hundred sixty-seven million, three hundred twelve thousand, nine hundred sixty-nine".