1281124005536 has 12 divisors (see below), whose sum is σ = 2522212885962. Its totient is φ = 640562002752.

The previous prime is 1281124005521. The next prime is 1281124005569. The reversal of 1281124005536 is 6355004211821.

It can be written as a sum of positive squares in only one way, i.e., 1239525955600 + 41598049936 = 1113340^2 + 203956^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1281124005536.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20017562555 + ... + 20017562618.

Almost surely, 2^{1281124005536} is an apocalyptic number.

1281124005536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1281124005536 is a deficient number, since it is larger than the sum of its proper divisors (1241088880426).

1281124005536 is an equidigital number, since it uses as much as digits as its factorization.

1281124005536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40035125183 (or 40035125175 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 1281124005536 in words is "one trillion, two hundred eighty-one billion, one hundred twenty-four million, five thousand, five hundred thirty-six".