1966889127 has 16 divisors (see below), whose sum is σ = 3100515840. Its totient is φ = 1085179872.

The previous prime is 1966889123. The next prime is 1966889129. The reversal of 1966889127 is 7219886691.

It is not a de Polignac number, because 1966889127 - 2² = 1966889123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1966889123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1614243 + ... + 1615460.

It is an arithmetic number, because the mean of its divisors is an integer number (193782240).

Almost surely, 2^1966889127 is an apocalyptic number.

1966889127 is a deficient number, since it is larger than the sum of its proper divisors (1133626713).

1966889127 is a wasteful number, since it uses less digits than its factorization.

1966889127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3229742.

The product of its digits is 2612736, while the sum is 57.

The square root of 1966889127 is about 44349.6237526318. The cubic root of 1966889127 is about 1252.9294762651.

The spelling of 1966889127 in words is "one billion, nine hundred sixty-six million, eight hundred eighty-nine thousand, one hundred twenty-seven".