1216471061567 has 4 divisors (see below), whose sum is σ = 1234627346136. Its totient is φ = 1198314777000.

The previous prime is 1216471061527. The next prime is 1216471061599. The reversal of 1216471061567 is 7651601746121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216471061567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216471061527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9078142184 + ... + 9078142317.

It is an arithmetic number, because the mean of its divisors is an integer number (308656836534).

Almost surely, 2^{1216471061567} is an apocalyptic number.

1216471061567 is a deficient number, since it is larger than the sum of its proper divisors (18156284569).

1216471061567 is an equidigital number, since it uses as much as digits as its factorization.

1216471061567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18156284568.

The product of its (nonzero) digits is 423360, while the sum is 47.

The spelling of 1216471061567 in words is "one trillion, two hundred sixteen billion, four hundred seventy-one million, sixty-one thousand, five hundred sixty-seven".