1278251066 has 16 divisors (see below), whose sum is σ = 1946609280. Its totient is φ = 629452080.

The previous prime is 1278251041. The next prime is 1278251069. The reversal of 1278251066 is 6601528721.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1278251069) 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 7 ways as a sum of consecutive naturals, for example, 18851 + ... + 53961.

It is an arithmetic number, because the mean of its divisors is an integer number (121663080).

Almost surely, 2^1278251066 is an apocalyptic number.

1278251066 is a deficient number, since it is larger than the sum of its proper divisors (668358214).

1278251066 is a wasteful number, since it uses less digits than its factorization.

1278251066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35389.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1278251066 is about 35752.6371894438. The cubic root of 1278251066 is about 1085.2723069416.

Adding to 1278251066 its reverse (6601528721), we get a palindrome (7879779787).

The spelling of 1278251066 in words is "one billion, two hundred seventy-eight million, two hundred fifty-one thousand, sixty-six".