127171666 has 4 divisors (see below), whose sum is σ = 190757502. Its totient is φ = 63585832.

The previous prime is 127171663. The next prime is 127171673. The reversal of 127171666 is 666171721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666171721 = 4157 ⋅160253.

It can be written as a sum of positive squares in only one way, i.e., 126900225 + 271441 = 11265^2 + 521^2 .

It is not an unprimeable number, because it can be changed into a prime (127171663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31792915 + ... + 31792918.

Almost surely, 2^127171666 is an apocalyptic number.

127171666 is a deficient number, since it is larger than the sum of its proper divisors (63585836).

127171666 is an equidigital number, since it uses as much as digits as its factorization.

127171666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63585835.

The product of its digits is 21168, while the sum is 37.

The square root of 127171666 is about 11277.0415446605. The cubic root of 127171666 is about 502.8789461888.

The spelling of 127171666 in words is "one hundred twenty-seven million, one hundred seventy-one thousand, six hundred sixty-six".