667181281604 has 24 divisors (see below), whose sum is σ = 1190427499800. Its totient is φ = 327067929344.

The previous prime is 667181281579. The next prime is 667181281609. The reversal of 667181281604 is 406182181766.

It can be written as a sum of positive squares in 4 ways, for example, as 283611632704 + 383569648900 = 532552^2 + 619330^2 .

It is not an unprimeable number, because it can be changed into a prime (667181281609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 794279 + ... + 1401870.

It is an arithmetic number, because the mean of its divisors is an integer number (49601145825).

Almost surely, 2^667181281604 is an apocalyptic number.

It is an amenable number.

667181281604 is a deficient number, since it is larger than the sum of its proper divisors (523246218196).

667181281604 is a wasteful number, since it uses less digits than its factorization.

667181281604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2197639 (or 2197637 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 667181281604 in words is "six hundred sixty-seven billion, one hundred eighty-one million, two hundred eighty-one thousand, six hundred four".