667221016672 has 48 divisors (see below), whose sum is σ = 1502660097792. Its totient is φ = 285682757760.

The previous prime is 667221016639. The next prime is 667221016673. The reversal of 667221016672 is 276610122766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667221016673) 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 7 ways as a sum of consecutive naturals, for example, 1162954 + ... + 1639177.

It is an arithmetic number, because the mean of its divisors is an integer number (31305418704).

Almost surely, 2^667221016672 is an apocalyptic number.

It is an amenable number.

667221016672 is an abundant number, since it is smaller than the sum of its proper divisors (835439081120).

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

667221016672 is a wasteful number, since it uses less digits than its factorization.

667221016672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803211 (or 2803203 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 46.

The spelling of 667221016672 in words is "six hundred sixty-seven billion, two hundred twenty-one million, sixteen thousand, six hundred seventy-two".