1278653169222 has 128 divisors (see below), whose sum is σ = 3353182801920. Its totient is φ = 356060862720.

The previous prime is 1278653169221. The next prime is 1278653169251. The reversal of 1278653169222 is 2229613568721.

1278653169222 is a `hidden beast` number, since 1 + 2 + 7 + 86 + 531 + 6 + 9 + 2 + 22 = 666.

It is a super-2 number, since 2×1278653169222² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278653169221) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 1350738 + ... + 2093274.

It is an arithmetic number, because the mean of its divisors is an integer number (26196740640).

Almost surely, 2^{1278653169222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278653169222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1676591400960).

1278653169222 is an abundant number, since it is smaller than the sum of its proper divisors (2074529632698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278653169222 is a wasteful number, since it uses less digits than its factorization.

1278653169222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742795 (or 742789 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 1278653169222 in words is "one trillion, two hundred seventy-eight billion, six hundred fifty-three million, one hundred sixty-nine thousand, two hundred twenty-two".