1216255263 has 16 divisors (see below), whose sum is σ = 1654965600. Its totient is φ = 794340864.

The previous prime is 1216255253. The next prime is 1216255279. The reversal of 1216255263 is 3625526121.

It is not a de Polignac number, because 1216255263 - 2⁶ = 1216255199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216255253) 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, 13995 + ... + 51267.

It is an arithmetic number, because the mean of its divisors is an integer number (103435350).

Almost surely, 2^1216255263 is an apocalyptic number.

1216255263 is a deficient number, since it is larger than the sum of its proper divisors (438710337).

1216255263 is a wasteful number, since it uses less digits than its factorization.

1216255263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37498.

The product of its digits is 21600, while the sum is 33.

The square root of 1216255263 is about 34874.8514405438. The cubic root of 1216255263 is about 1067.4353411284.

The spelling of 1216255263 in words is "one billion, two hundred sixteen million, two hundred fifty-five thousand, two hundred sixty-three".