667881039996 has 72 divisors (see below), whose sum is σ = 1777224168720. Its totient is φ = 210896296704.

The previous prime is 667881039961. The next prime is 667881039997. The reversal of 667881039996 is 699930188766.

667881039996 is a `hidden beast` number, since 6 + 6 + 78 + 81 + 0 + 399 + 96 = 666.

It is a super-2 number, since 2×667881039996² (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 (667881039997) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20704296 + ... + 20736528.

It is an arithmetic number, because the mean of its divisors is an integer number (24683669010).

Almost surely, 2^667881039996 is an apocalyptic number.

It is an amenable number.

667881039996 is an abundant number, since it is smaller than the sum of its proper divisors (1109343128724).

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

667881039996 is a wasteful number, since it uses less digits than its factorization.

667881039996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62555 (or 62550 counting only the distinct ones).

The product of its (nonzero) digits is 211631616, while the sum is 72.

The spelling of 667881039996 in words is "six hundred sixty-seven billion, eight hundred eighty-one million, thirty-nine thousand, nine hundred ninety-six".