667089718401 has 16 divisors (see below), whose sum is σ = 939746836800. Its totient is φ = 419753567808.

The previous prime is 667089718381. The next prime is 667089718447. The reversal of 667089718401 is 104817980766.

It is a happy number.

It is not a de Polignac number, because 667089718401 - 2¹⁹ = 667089194113 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667089718481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21738066 + ... + 21768731.

It is an arithmetic number, because the mean of its divisors is an integer number (58734177300).

Almost surely, 2^667089718401 is an apocalyptic number.

It is an amenable number.

667089718401 is a deficient number, since it is larger than the sum of its proper divisors (272657118399).

667089718401 is a wasteful number, since it uses less digits than its factorization.

667089718401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43507088.

The product of its (nonzero) digits is 4064256, while the sum is 57.

The spelling of 667089718401 in words is "six hundred sixty-seven billion, eighty-nine million, seven hundred eighteen thousand, four hundred one".