1156807816281 has 24 divisors (see below), whose sum is σ = 1799682791816. Its totient is φ = 711801043200.

The previous prime is 1156807816273. The next prime is 1156807816313. The reversal of 1156807816281 is 1826187086511.

1156807816281 is a `hidden beast` number, since 1 + 1 + 5 + 6 + 8 + 0 + 7 + 8 + 1 + 628 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20684192400 + 1136123623881 = 143820^2 + 1065891^2 .

It is not a de Polignac number, because 1156807816281 - 2³ = 1156807816273 is a prime.

It is a super-2 number, since 2×1156807816281² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1156807816231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 484581 + ... + 1596381.

Almost surely, 2^{1156807816281} is an apocalyptic number.

It is an amenable number.

1156807816281 is a deficient number, since it is larger than the sum of its proper divisors (642874975535).

1156807816281 is a wasteful number, since it uses less digits than its factorization.

1156807816281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120713 (or 1120710 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 54.

The spelling of 1156807816281 in words is "one trillion, one hundred fifty-six billion, eight hundred seven million, eight hundred sixteen thousand, two hundred eighty-one".