1216634355 has 24 divisors (see below), whose sum is σ = 2113098000. Its totient is φ = 647559360.

The previous prime is 1216634351. The next prime is 1216634357. The reversal of 1216634355 is 5534366121.

1216634355 is a `hidden beast` number, since 1 + 2 + 16 + 634 + 3 + 5 + 5 = 666.

It is not a de Polignac number, because 1216634355 - 2² = 1216634351 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216634351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4636 + ... + 49545.

It is an arithmetic number, because the mean of its divisors is an integer number (88045750).

Almost surely, 2^1216634355 is an apocalyptic number.

1216634355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216634355 is a deficient number, since it is larger than the sum of its proper divisors (896463645).

1216634355 is a wasteful number, since it uses less digits than its factorization.

1216634355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54691 (or 54688 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 1216634355 is about 34880.2860510059. The cubic root of 1216634355 is about 1067.5462318205.

The spelling of 1216634355 in words is "one billion, two hundred sixteen million, six hundred thirty-four thousand, three hundred fifty-five".