127666642 has 8 divisors (see below), whose sum is σ = 198103500. Its totient is φ = 61632144.

The previous prime is 127666639. The next prime is 127666663. The reversal of 127666642 is 246666721.

It can be written as a sum of positive squares in 2 ways, for example, as 123899161 + 3767481 = 11131^2 + 1941^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 127666595 and 127666604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100517 + ... + 1100632.

Almost surely, 2^127666642 is an apocalyptic number.

127666642 is a deficient number, since it is larger than the sum of its proper divisors (70436858).

127666642 is a wasteful number, since it uses less digits than its factorization.

127666642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2201180.

The product of its digits is 145152, while the sum is 40.

The square root of 127666642 is about 11298.9664129070. The cubic root of 127666642 is about 503.5305346410.

The spelling of 127666642 in words is "one hundred twenty-seven million, six hundred sixty-six thousand, six hundred forty-two".