1281605361836 has 24 divisors (see below), whose sum is σ = 2290755149760. Its totient is φ = 627106586112.

The previous prime is 1281605361833. The next prime is 1281605361859. The reversal of 1281605361836 is 6381635061821.

It is not an unprimeable number, because it can be changed into a prime (1281605361833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1599530 + ... + 2263118.

It is an arithmetic number, because the mean of its divisors is an integer number (95448131240).

Almost surely, 2^{1281605361836} is an apocalyptic number.

It is an amenable number.

1281605361836 is a deficient number, since it is larger than the sum of its proper divisors (1009149787924).

1281605361836 is a wasteful number, since it uses less digits than its factorization.

1281605361836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673913 (or 673911 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 50.

The spelling of 1281605361836 in words is "one trillion, two hundred eighty-one billion, six hundred five million, three hundred sixty-one thousand, eight hundred thirty-six".