667073700661 has 2 divisors, whose sum is σ = 667073700662. Its totient is φ = 667073700660.

The previous prime is 667073700611. The next prime is 667073700673. The reversal of 667073700661 is 166007370766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 615581468100 + 51492232561 = 784590^2 + 226919^2 .

It is a cyclic number.

It is not a de Polignac number, because 667073700661 - 2⁹ = 667073700149 is a prime.

It is a super-2 number, since 2×667073700661² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667073700611) 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 as a sum of consecutive naturals, namely, 333536850330 + 333536850331.

It is an arithmetic number, because the mean of its divisors is an integer number (333536850331).

Almost surely, 2^667073700661 is an apocalyptic number.

It is an amenable number.

667073700661 is a deficient number, since it is larger than the sum of its proper divisors (1).

667073700661 is an equidigital number, since it uses as much as digits as its factorization.

667073700661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 49.

The spelling of 667073700661 in words is "six hundred sixty-seven billion, seventy-three million, seven hundred thousand, six hundred sixty-one".