667420571028 has 12 divisors (see below), whose sum is σ = 1557314665760. Its totient is φ = 222473523672.

The previous prime is 667420571011. The next prime is 667420571099. The reversal of 667420571028 is 820175024766.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27809190448 + ... + 27809190471.

Almost surely, 2^667420571028 is an apocalyptic number.

It is an amenable number.

667420571028 is an abundant number, since it is smaller than the sum of its proper divisors (889894094732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667420571028 is a wasteful number, since it uses less digits than its factorization.

667420571028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55618380926 (or 55618380924 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 667420571028 in words is "six hundred sixty-seven billion, four hundred twenty million, five hundred seventy-one thousand, twenty-eight".