667668326667 has 64 divisors (see below), whose sum is σ = 978725928960. Its totient is φ = 403034112000.

The previous prime is 667668326639. The next prime is 667668326671. The reversal of 667668326667 is 766623866766.

It is not a de Polignac number, because 667668326667 - 2¹¹ = 667668324619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667668321667) 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 63 ways as a sum of consecutive naturals, for example, 342217542 + ... + 342219492.

It is an arithmetic number, because the mean of its divisors is an integer number (15292592640).

Almost surely, 2^667668326667 is an apocalyptic number.

667668326667 is a deficient number, since it is larger than the sum of its proper divisors (311057602293).

667668326667 is a wasteful number, since it uses less digits than its factorization.

667668326667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164.

The product of its digits is 658409472, while the sum is 69.

The spelling of 667668326667 in words is "six hundred sixty-seven billion, six hundred sixty-eight million, three hundred twenty-six thousand, six hundred sixty-seven".