666672278886 has 24 divisors (see below), whose sum is σ = 1444605300840. Its totient is φ = 222201216576.

The previous prime is 666672278849. The next prime is 666672278963. The reversal of 666672278886 is 688872276666.

It is a happy number.

It is a super-2 number, since 2×666672278886² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1726195 + ... + 2076798.

It is an arithmetic number, because the mean of its divisors is an integer number (60191887535).

Almost surely, 2^666672278886 is an apocalyptic number.

666672278886 is an abundant number, since it is smaller than the sum of its proper divisors (777933021954).

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

666672278886 is a wasteful number, since it uses less digits than its factorization.

666672278886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812740 (or 3812737 counting only the distinct ones).

The product of its digits is 780337152, while the sum is 72.

The spelling of 666672278886 in words is "six hundred sixty-six billion, six hundred seventy-two million, two hundred seventy-eight thousand, eight hundred eighty-six".