127666818 has 12 divisors (see below), whose sum is σ = 276611478. Its totient is φ = 42555600.

The previous prime is 127666811. The next prime is 127666837. The reversal of 127666818 is 818666721.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 103489929 + 24176889 = 10173^2 + 4917^2 .

It is not an unprimeable number, because it can be changed into a prime (127666811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3546283 + ... + 3546318.

Almost surely, 2^127666818 is an apocalyptic number.

127666818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

127666818 is an abundant number, since it is smaller than the sum of its proper divisors (148944660).

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

127666818 is a wasteful number, since it uses less digits than its factorization.

127666818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7092609 (or 7092606 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 127666818 is about 11298.9742012273. The cubic root of 127666818 is about 503.5307660283.

The spelling of 127666818 in words is "one hundred twenty-seven million, six hundred sixty-six thousand, eight hundred eighteen".