667667675521 has 24 divisors (see below), whose sum is σ = 847383413760. Its totient is φ = 520197904800.

The previous prime is 667667675513. The next prime is 667667675531. The reversal of 667667675521 is 125576766766.

It is not a de Polignac number, because 667667675521 - 2³ = 667667675513 is a prime.

It is a super-3 number, since 3×667667675521³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667667675531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4689775 + ... + 4830043.

It is an arithmetic number, because the mean of its divisors is an integer number (35307642240).

Almost surely, 2^667667675521 is an apocalyptic number.

It is an amenable number.

667667675521 is a deficient number, since it is larger than the sum of its proper divisors (179715738239).

667667675521 is a wasteful number, since it uses less digits than its factorization.

667667675521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149125 (or 149118 counting only the distinct ones).

The product of its digits is 133358400, while the sum is 64.

The spelling of 667667675521 in words is "six hundred sixty-seven billion, six hundred sixty-seven million, six hundred seventy-five thousand, five hundred twenty-one".