1242656336673 has 12 divisors (see below), whose sum is σ = 1900533221028. Its totient is φ = 779705936640.

The previous prime is 1242656336659. The next prime is 1242656336681. The reversal of 1242656336673 is 3766336562421.

1242656336673 is a `hidden beast` number, since 1 + 2 + 4 + 2 + 6 + 563 + 3 + 6 + 6 + 73 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 331876231569 + 910780105104 = 576087^2 + 954348^2 .

It is not a de Polignac number, because 1242656336673 - 2²¹ = 1242654239521 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1242656336573) 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 11 ways as a sum of consecutive naturals, for example, 4060968268 + ... + 4060968573.

It is an arithmetic number, because the mean of its divisors is an integer number (158377768419).

Almost surely, 2^{1242656336673} is an apocalyptic number.

It is an amenable number.

1242656336673 is a deficient number, since it is larger than the sum of its proper divisors (657876884355).

1242656336673 is a wasteful number, since it uses less digits than its factorization.

1242656336673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8121936864 (or 8121936861 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 54.

The spelling of 1242656336673 in words is "one trillion, two hundred forty-two billion, six hundred fifty-six million, three hundred thirty-six thousand, six hundred seventy-three".