1216440148255 has 4 divisors (see below), whose sum is σ = 1459728177912. Its totient is φ = 973152118600.

The previous prime is 1216440148201. The next prime is 1216440148279. The reversal of 1216440148255 is 5528410446121.

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

It is not a de Polignac number, because 1216440148255 - 2⁹ = 1216440147743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 121644014821 + ... + 121644014830.

It is an arithmetic number, because the mean of its divisors is an integer number (364932044478).

Almost surely, 2^{1216440148255} is an apocalyptic number.

1216440148255 is a deficient number, since it is larger than the sum of its proper divisors (243288029657).

1216440148255 is an equidigital number, since it uses as much as digits as its factorization.

1216440148255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243288029656.

The product of its (nonzero) digits is 307200, while the sum is 43.

The spelling of 1216440148255 in words is "one trillion, two hundred sixteen billion, four hundred forty million, one hundred forty-eight thousand, two hundred fifty-five".