667417557666 has 32 divisors (see below), whose sum is σ = 1348917958080. Its totient is φ = 220126473216.

The previous prime is 667417557629. The next prime is 667417557673. The reversal of 667417557666 is 666755714766.

It is a junction number, because it is equal to n+sod(n) for n = 667417557597 and 667417557606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2344110 + ... + 2613366.

It is an arithmetic number, because the mean of its divisors is an integer number (42153686190).

Almost surely, 2^667417557666 is an apocalyptic number.

667417557666 is an abundant number, since it is smaller than the sum of its proper divisors (681500400414).

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

667417557666 is a wasteful number, since it uses less digits than its factorization.

667417557666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273618.

The product of its digits is 266716800, while the sum is 66.

The spelling of 667417557666 in words is "six hundred sixty-seven billion, four hundred seventeen million, five hundred fifty-seven thousand, six hundred sixty-six".