667420568605 has 32 divisors (see below), whose sum is σ = 920895462144. Its totient is φ = 454880365056.

The previous prime is 667420568587. The next prime is 667420568609. The reversal of 667420568605 is 506865024766.

It is a cyclic number.

It is not a de Polignac number, because 667420568605 - 2¹¹ = 667420566557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667420568609) 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, 3713599 + ... + 3889171.

It is an arithmetic number, because the mean of its divisors is an integer number (28777983192).

Almost surely, 2^667420568605 is an apocalyptic number.

It is an amenable number.

667420568605 is a deficient number, since it is larger than the sum of its proper divisors (253474893539).

667420568605 is a wasteful number, since it uses less digits than its factorization.

667420568605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176245.

The product of its (nonzero) digits is 14515200, while the sum is 55.

The spelling of 667420568605 in words is "six hundred sixty-seven billion, four hundred twenty million, five hundred sixty-eight thousand, six hundred five".