1216231466 has 16 divisors (see below), whose sum is σ = 1833685440. Its totient is φ = 605011680.

The previous prime is 1216231433. The next prime is 1216231529. The reversal of 1216231466 is 6641326121.

1216231466 = 24² + 25² + ... + 1539².

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 344651 + ... + 348161.

It is an arithmetic number, because the mean of its divisors is an integer number (114605340).

Almost surely, 2^1216231466 is an apocalyptic number.

1216231466 is a deficient number, since it is larger than the sum of its proper divisors (617453974).

1216231466 is a wasteful number, since it uses less digits than its factorization.

1216231466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4349.

The product of its digits is 10368, while the sum is 32.

The square root of 1216231466 is about 34874.5102617944. The cubic root of 1216231466 is about 1067.4283793430.

Adding to 1216231466 its reverse (6641326121), we get a palindrome (7857557587).

The spelling of 1216231466 in words is "one billion, two hundred sixteen million, two hundred thirty-one thousand, four hundred sixty-six".