1216661014 has 16 divisors (see below), whose sum is σ = 1839025152. Its totient is φ = 603664488.

The previous prime is 1216661011. The next prime is 1216661021. The reversal of 1216661014 is 4101666121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216661011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 239707 + ... + 244729.

It is an arithmetic number, because the mean of its divisors is an integer number (114939072).

Almost surely, 2^1216661014 is an apocalyptic number.

1216661014 is a deficient number, since it is larger than the sum of its proper divisors (622364138).

1216661014 is a wasteful number, since it uses less digits than its factorization.

1216661014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5931.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1216661014 is about 34880.6681988749. The cubic root of 1216661014 is about 1067.5540291528.

The spelling of 1216661014 in words is "one billion, two hundred sixteen million, six hundred sixty-one thousand, fourteen".