1216404727567 has 4 divisors (see below), whose sum is σ = 1216421453880. Its totient is φ = 1216388001256.

The previous prime is 1216404727543. The next prime is 1216404727589. The reversal of 1216404727567 is 7657274046121.

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-1216404727567 is a prime.

It is a super-3 number, since 3×1216404727567³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216404727537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8253592 + ... + 8399677.

It is an arithmetic number, because the mean of its divisors is an integer number (304105363470).

Almost surely, 2^{1216404727567} is an apocalyptic number.

1216404727567 is a deficient number, since it is larger than the sum of its proper divisors (16726313).

1216404727567 is an equidigital number, since it uses as much as digits as its factorization.

1216404727567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16726312.

The product of its (nonzero) digits is 3951360, while the sum is 52.

The spelling of 1216404727567 in words is "one trillion, two hundred sixteen billion, four hundred four million, seven hundred twenty-seven thousand, five hundred sixty-seven".