1213265566 has 8 divisors (see below), whose sum is σ = 1821347640. Its totient is φ = 606149688.

The previous prime is 1213265549. The next prime is 1213265579. The reversal of 1213265566 is 6655623121.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238401 + ... + 243436.

It is an arithmetic number, because the mean of its divisors is an integer number (227668455).

Almost surely, 2^1213265566 is an apocalyptic number.

1213265566 is a deficient number, since it is larger than the sum of its proper divisors (608082074).

1213265566 is a wasteful number, since it uses less digits than its factorization.

1213265566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483098.

The product of its digits is 64800, while the sum is 37.

The square root of 1213265566 is about 34831.9618454086. The cubic root of 1213265566 is about 1066.5599967332.

Adding to 1213265566 its reverse (6655623121), we get a palindrome (7868888687).

The spelling of 1213265566 in words is "one billion, two hundred thirteen million, two hundred sixty-five thousand, five hundred sixty-six".