1781053628842 has 4 divisors (see below), whose sum is σ = 2671580443266. Its totient is φ = 890526814420.

The previous prime is 1781053628713. The next prime is 1781053628899. The reversal of 1781053628842 is 2488263501871.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1230948089361 + 550105539481 = 1109481^2 + 741691^2 .

It is a super-2 number, since 2×1781053628842² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445263407209 + ... + 445263407212.

Almost surely, 2^{1781053628842} is an apocalyptic number.

1781053628842 is a deficient number, since it is larger than the sum of its proper divisors (890526814424).

1781053628842 is an equidigital number, since it uses as much as digits as its factorization.

1781053628842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890526814423.

The product of its (nonzero) digits is 5160960, while the sum is 55.

The spelling of 1781053628842 in words is "one trillion, seven hundred eighty-one billion, fifty-three million, six hundred twenty-eight thousand, eight hundred forty-two".