667880647555 has 64 divisors (see below), whose sum is σ = 935642534400. Its totient is φ = 452295198720.

The previous prime is 667880647537. The next prime is 667880647631. The reversal of 667880647555 is 555746088766.

It is not a de Polignac number, because 667880647555 - 2⁵ = 667880647523 is a prime.

It is a super-2 number, since 2×667880647555² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 in 63 ways as a sum of consecutive naturals, for example, 38070976 + ... + 38088514.

It is an arithmetic number, because the mean of its divisors is an integer number (14619414600).

Almost surely, 2^667880647555 is an apocalyptic number.

667880647555 is a deficient number, since it is larger than the sum of its proper divisors (267761886845).

667880647555 is a wasteful number, since it uses less digits than its factorization.

667880647555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18004.

The product of its (nonzero) digits is 338688000, while the sum is 67.

The spelling of 667880647555 in words is "six hundred sixty-seven billion, eight hundred eighty million, six hundred forty-seven thousand, five hundred fifty-five".