1216585567 has 4 divisors (see below), whose sum is σ = 1249466296. Its totient is φ = 1183704840.

The previous prime is 1216585547. The next prime is 1216585571. The reversal of 1216585567 is 7655856121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7655856121 = 7529 ⋅1016849.

It is a cyclic number.

It is not a de Polignac number, because 1216585567 - 2⁷ = 1216585439 is a prime.

It is a super-2 number, since 2×1216585567² = 2960160883665422978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216585507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16440309 + ... + 16440382.

It is an arithmetic number, because the mean of its divisors is an integer number (312366574).

Almost surely, 2^1216585567 is an apocalyptic number.

1216585567 is a deficient number, since it is larger than the sum of its proper divisors (32880729).

1216585567 is an equidigital number, since it uses as much as digits as its factorization.

1216585567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32880728.

The product of its digits is 504000, while the sum is 46.

The square root of 1216585567 is about 34879.5866804640. The cubic root of 1216585567 is about 1067.5319618136.

The spelling of 1216585567 in words is "one billion, two hundred sixteen million, five hundred eighty-five thousand, five hundred sixty-seven".