1216006633 has 4 divisors (see below), whose sum is σ = 1219070020. Its totient is φ = 1212943248.

The previous prime is 1216006621. The next prime is 1216006637. The reversal of 1216006633 is 3366006121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 500551129 + 715455504 = 22373^2 + 26748^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216006633 - 2⁵ = 1216006601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216006637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1531098 + ... + 1531891.

It is an arithmetic number, because the mean of its divisors is an integer number (304767505).

Almost surely, 2^1216006633 is an apocalyptic number.

It is an amenable number.

1216006633 is a deficient number, since it is larger than the sum of its proper divisors (3063387).

1216006633 is an equidigital number, since it uses as much as digits as its factorization.

1216006633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063386.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1216006633 is about 34871.2866553559. The cubic root of 1216006633 is about 1067.3626002208.

The spelling of 1216006633 in words is "one billion, two hundred sixteen million, six thousand, six hundred thirty-three".