1278956685616 has 20 divisors (see below), whose sum is σ = 2478004134192. Its totient is φ = 639471747776.

The previous prime is 1278956685599. The next prime is 1278956685631. The reversal of 1278956685616 is 6165866598721.

It is a super-2 number, since 2×1278956685616² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1439886 + ... + 2152018.

Almost surely, 2^{1278956685616} is an apocalyptic number.

1278956685616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278956685616 is a deficient number, since it is larger than the sum of its proper divisors (1199047448576).

1278956685616 is a wasteful number, since it uses less digits than its factorization.

1278956685616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824388 (or 824382 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 70.

The spelling of 1278956685616 in words is "one trillion, two hundred seventy-eight billion, nine hundred fifty-six million, six hundred eighty-five thousand, six hundred sixteen".