667441266661 has 32 divisors (see below), whose sum is σ = 810848183040. Its totient is φ = 543206974464.

The previous prime is 667441266647. The next prime is 667441266683. The reversal of 667441266661 is 166662144766.

It is a cyclic number.

It is not a de Polignac number, because 667441266661 - 2¹³ = 667441258469 is a prime.

It is a super-2 number, since 2×667441266661² (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 (667441266601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1377460 + ... + 1797853.

It is an arithmetic number, because the mean of its divisors is an integer number (25339005720).

Almost surely, 2^667441266661 is an apocalyptic number.

It is an amenable number.

667441266661 is a deficient number, since it is larger than the sum of its proper divisors (143406916379).

667441266661 is a wasteful number, since it uses less digits than its factorization.

667441266661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3175405.

The product of its digits is 10450944, while the sum is 55.

The spelling of 667441266661 in words is "six hundred sixty-seven billion, four hundred forty-one million, two hundred sixty-six thousand, six hundred sixty-one".