1216896255 has 12 divisors (see below), whose sum is σ = 2109286920. Its totient is φ = 649011312.

The previous prime is 1216896217. The next prime is 1216896257. The reversal of 1216896255 is 5526986121.

1216896255 is a `hidden beast` number, since 1 + 2 + 16 + 8 + 9 + 625 + 5 = 666.

It is not a de Polignac number, because 1216896255 - 2¹¹ = 1216894207 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 27042139 = 1216896255 / (1 + 2 + 1 + 6 + 8 + 9 + 6 + 2 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 1216896255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216896257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13521025 + ... + 13521114.

It is an arithmetic number, because the mean of its divisors is an integer number (175773910).

Almost surely, 2^1216896255 is an apocalyptic number.

1216896255 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216896255 is a deficient number, since it is larger than the sum of its proper divisors (892390665).

1216896255 is a wasteful number, since it uses less digits than its factorization.

1216896255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27042150 (or 27042147 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 1216896255 is about 34884.0401186560. The cubic root of 1216896255 is about 1067.6228284570.

The spelling of 1216896255 in words is "one billion, two hundred sixteen million, eight hundred ninety-six thousand, two hundred fifty-five".