1271784159243 has 40 divisors (see below), whose sum is σ = 2046255428448. Its totient is φ = 782525753856.

The previous prime is 1271784159221. The next prime is 1271784159251. The reversal of 1271784159243 is 3429514871721.

It is a happy number.

1271784159243 is a `hidden beast` number, since 1 + 2 + 7 + 1 + 7 + 8 + 4 + 1 + 592 + 43 = 666.

It is not a de Polignac number, because 1271784159243 - 2⁹ = 1271784158731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1271784159243.

It is not an unprimeable number, because it can be changed into a prime (1271784159263) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 7703146 + ... + 7866512.

Almost surely, 2^{1271784159243} is an apocalyptic number.

1271784159243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1271784159243 is a deficient number, since it is larger than the sum of its proper divisors (774471269205).

1271784159243 is a wasteful number, since it uses less digits than its factorization.

1271784159243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170785 (or 170776 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 1271784159243 in words is "one trillion, two hundred seventy-one billion, seven hundred eighty-four million, one hundred fifty-nine thousand, two hundred forty-three".