667882700021 has 2 divisors, whose sum is σ = 667882700022. Its totient is φ = 667882700020.

The previous prime is 667882699949. The next prime is 667882700041. The reversal of 667882700021 is 120007288766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615104529796 + 52778170225 = 784286^2 + 229735^2 .

It is a cyclic number.

It is not a de Polignac number, because 667882700021 - 2¹⁸ = 667882437877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667882700041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333941350010 + 333941350011.

It is an arithmetic number, because the mean of its divisors is an integer number (333941350011).

Almost surely, 2^667882700021 is an apocalyptic number.

It is an amenable number.

667882700021 is a deficient number, since it is larger than the sum of its proper divisors (1).

667882700021 is an equidigital number, since it uses as much as digits as its factorization.

667882700021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 451584, while the sum is 47.

Adding to 667882700021 its reverse (120007288766), we get a palindrome (787889988787).

The spelling of 667882700021 in words is "six hundred sixty-seven billion, eight hundred eighty-two million, seven hundred thousand, twenty-one".