667881039997 has 2 divisors, whose sum is σ = 667881039998. Its totient is φ = 667881039996.

The previous prime is 667881039961. The next prime is 667881040103. The reversal of 667881039997 is 799930188766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372125620441 + 295755419556 = 610021^2 + 543834^2 .

It is a cyclic number.

It is not a de Polignac number, because 667881039997 - 2⁷ = 667881039869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667881009997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333940519998 + 333940519999.

It is an arithmetic number, because the mean of its divisors is an integer number (333940519999).

Almost surely, 2^667881039997 is an apocalyptic number.

It is an amenable number.

667881039997 is a deficient number, since it is larger than the sum of its proper divisors (1).

667881039997 is an equidigital number, since it uses as much as digits as its factorization.

667881039997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246903552, while the sum is 73.

The spelling of 667881039997 in words is "six hundred sixty-seven billion, eight hundred eighty-one million, thirty-nine thousand, nine hundred ninety-seven".