1216662473 has 8 divisors (see below), whose sum is σ = 1379212800. Its totient is φ = 1063963728.

The previous prime is 1216662467. The next prime is 1216662479. The reversal of 1216662473 is 3742666121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1216662467) and next prime (1216662479).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216662473 - 2²⁸ = 948227017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216662479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2462633 + ... + 2463126.

It is an arithmetic number, because the mean of its divisors is an integer number (172401600).

Almost surely, 2^1216662473 is an apocalyptic number.

1216662473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1216662473 is a deficient number, since it is larger than the sum of its proper divisors (162550327).

1216662473 is a wasteful number, since it uses less digits than its factorization.

1216662473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4925791.

The product of its digits is 72576, while the sum is 38.

The square root of 1216662473 is about 34880.6891130322. The cubic root of 1216662473 is about 1067.5544558837.

The spelling of 1216662473 in words is "one billion, two hundred sixteen million, six hundred sixty-two thousand, four hundred seventy-three".