127661661 has 12 divisors (see below), whose sum is σ = 192417888. Its totient is φ = 81407304.

The previous prime is 127661657. The next prime is 127661701. The reversal of 127661661 is 166166721.

It is not a de Polignac number, because 127661661 - 2² = 127661657 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127661641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308155 + ... + 308568.

It is an arithmetic number, because the mean of its divisors is an integer number (16034824).

Almost surely, 2^127661661 is an apocalyptic number.

It is an amenable number.

127661661 is a deficient number, since it is larger than the sum of its proper divisors (64756227).

127661661 is a wasteful number, since it uses less digits than its factorization.

127661661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616752 (or 616749 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 127661661 is about 11298.7459923657. The cubic root of 127661661 is about 503.5239860282.

The spelling of 127661661 in words is "one hundred twenty-seven million, six hundred sixty-one thousand, six hundred sixty-one".