1216256464263 has 4 divisors (see below), whose sum is σ = 1621675285688. Its totient is φ = 810837642840.

The previous prime is 1216256464219. The next prime is 1216256464273. The reversal of 1216256464263 is 3624646526121.

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

It is not a de Polignac number, because 1216256464263 - 2¹⁷ = 1216256333191 is a prime.

It is a super-2 number, since 2×1216256464263² (a number of 25 digits) 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 (1216256464273) 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, 202709410708 + ... + 202709410713.

It is an arithmetic number, because the mean of its divisors is an integer number (405418821422).

Almost surely, 2^{1216256464263} is an apocalyptic number.

1216256464263 is a deficient number, since it is larger than the sum of its proper divisors (405418821425).

1216256464263 is an equidigital number, since it uses as much as digits as its factorization.

1216256464263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405418821424.

The product of its digits is 2488320, while the sum is 48.

The spelling of 1216256464263 in words is "one trillion, two hundred sixteen billion, two hundred fifty-six million, four hundred sixty-four thousand, two hundred sixty-three".