667667531805 has 32 divisors (see below), whose sum is σ = 1070149515264. Its totient is φ = 355462718016.

The previous prime is 667667531789. The next prime is 667667531819. The reversal of 667667531805 is 508135766766.

It is not a de Polignac number, because 667667531805 - 2⁴ = 667667531789 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 22164384 + ... + 22194486.

It is an arithmetic number, because the mean of its divisors is an integer number (33442172352).

Almost surely, 2^667667531805 is an apocalyptic number.

It is an amenable number.

667667531805 is a deficient number, since it is larger than the sum of its proper divisors (402481983459).

667667531805 is a wasteful number, since it uses less digits than its factorization.

667667531805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32665.

The product of its (nonzero) digits is 38102400, while the sum is 60.

The spelling of 667667531805 in words is "six hundred sixty-seven billion, six hundred sixty-seven million, five hundred thirty-one thousand, eight hundred five".