667486645640 has 32 divisors (see below), whose sum is σ = 1522418177880. Its totient is φ = 263337196032.

The previous prime is 667486645619. The next prime is 667486645687. The reversal of 667486645640 is 46546684766.

It can be written as a sum of positive squares in 4 ways, for example, as 478805873764 + 188680771876 = 691958^2 + 434374^2 .

It is a super-3 number, since 3×667486645640³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114292739 + ... + 114298578.

Almost surely, 2^667486645640 is an apocalyptic number.

It is an amenable number.

667486645640 is an abundant number, since it is smaller than the sum of its proper divisors (854931532240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667486645640 is a wasteful number, since it uses less digits than its factorization.

667486645640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228591401 (or 228591397 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 62.

The spelling of 667486645640 in words is "six hundred sixty-seven billion, four hundred eighty-six million, six hundred forty-five thousand, six hundred forty".