667945466788 has 12 divisors (see below), whose sum is σ = 1172639088460. Its totient is φ = 332905727232.

The previous prime is 667945466777. The next prime is 667945466789. The reversal of 667945466788 is 887664549766.

It can be written as a sum of positive squares in 2 ways, for example, as 197818573824 + 470126892964 = 444768^2 + 685658^2 .

It is a super-2 number, since 2×667945466788² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667945466789) 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, 266750133 + ... + 266752636.

Almost surely, 2^667945466788 is an apocalyptic number.

It is an amenable number.

667945466788 is a deficient number, since it is larger than the sum of its proper divisors (504693621672).

667945466788 is a wasteful number, since it uses less digits than its factorization.

667945466788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533503086 (or 533503084 counting only the distinct ones).

The product of its digits is 2926264320, while the sum is 76.

The spelling of 667945466788 in words is "six hundred sixty-seven billion, nine hundred forty-five million, four hundred sixty-six thousand, seven hundred eighty-eight".