667688664436 has 48 divisors (see below), whose sum is σ = 1224724596480. Its totient is φ = 317900563200.

The previous prime is 667688664389. The next prime is 667688664439. The reversal of 667688664436 is 634466886766.

It is a super-2 number, since 2×667688664436² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667688664439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19833010 + ... + 19866646.

It is an arithmetic number, because the mean of its divisors is an integer number (25515095760).

Almost surely, 2^667688664436 is an apocalyptic number.

It is an amenable number.

667688664436 is a deficient number, since it is larger than the sum of its proper divisors (557035932044).

667688664436 is a wasteful number, since it uses less digits than its factorization.

667688664436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34624 (or 34622 counting only the distinct ones).

The product of its digits is 1003290624, while the sum is 70.

The spelling of 667688664436 in words is "six hundred sixty-seven billion, six hundred eighty-eight million, six hundred sixty-four thousand, four hundred thirty-six".