667856981106 has 48 divisors (see below), whose sum is σ = 1655741041344. Its totient is φ = 190585517472.

The previous prime is 667856981093. The next prime is 667856981131. The reversal of 667856981106 is 601189658766.

667856981106 is a `hidden beast` number, since 6 + 67 + 8 + 569 + 8 + 1 + 1 + 0 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3100425 + ... + 3308828.

It is an arithmetic number, because the mean of its divisors is an integer number (34494605028).

Almost surely, 2^667856981106 is an apocalyptic number.

667856981106 is an abundant number, since it is smaller than the sum of its proper divisors (987884060238).

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

667856981106 is a wasteful number, since it uses less digits than its factorization.

667856981106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6410095 (or 6410092 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 667856981106 in words is "six hundred sixty-seven billion, eight hundred fifty-six million, nine hundred eighty-one thousand, one hundred six".