1271854078218 has 12 divisors (see below), whose sum is σ = 2755683836178. Its totient is φ = 423951359400.

The previous prime is 1271854078211. The next prime is 1271854078219. The reversal of 1271854078218 is 8128704581721.

1271854078218 is a `hidden beast` number, since 1 + 2 + 7 + 1 + 8 + 540 + 7 + 82 + 18 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1168468035849 + 103386042369 = 1080957^2 + 321537^2 .

It is a super-2 number, since 2×1271854078218² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1271854078211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35329279933 + ... + 35329279968.

Almost surely, 2^{1271854078218} is an apocalyptic number.

1271854078218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1271854078218 is an abundant number, since it is smaller than the sum of its proper divisors (1483829757960).

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

1271854078218 is a wasteful number, since it uses less digits than its factorization.

1271854078218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70658559909 (or 70658559906 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 54.

The spelling of 1271854078218 in words is "one trillion, two hundred seventy-one billion, eight hundred fifty-four million, seventy-eight thousand, two hundred eighteen".