1216726956278 has 4 divisors (see below), whose sum is σ = 1825090434420. Its totient is φ = 608363478138.

The previous prime is 1216726956257. The next prime is 1216726956311. The reversal of 1216726956278 is 8726596276121.

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

It is a super-2 number, since 2×1216726956278² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1216726956278.

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 as a sum of consecutive naturals, namely, 304181739068 + ... + 304181739071.

It is an arithmetic number, because the mean of its divisors is an integer number (456272608605).

Almost surely, 2^{1216726956278} is an apocalyptic number.

1216726956278 is a deficient number, since it is larger than the sum of its proper divisors (608363478142).

1216726956278 is an equidigital number, since it uses as much as digits as its factorization.

1216726956278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608363478141.

The product of its digits is 30481920, while the sum is 62.

The spelling of 1216726956278 in words is "one trillion, two hundred sixteen billion, seven hundred twenty-six million, nine hundred fifty-six thousand, two hundred seventy-eight".