1781766004338 has 16 divisors (see below), whose sum is σ = 3959480009760. Its totient is φ = 593922001428.

The previous prime is 1781766004331. The next prime is 1781766004367. The reversal of 1781766004338 is 8334006671871.

1781766004338 is a `hidden beast` number, since 1 + 7 + 81 + 76 + 60 + 0 + 433 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 32995666747 = 1781766004338 / (1 + 7 + 8 + 1 + 7 + 6 + 6 + 0 + 0 + 4 + 3 + 3 + 8).

It is not an unprimeable number, because it can be changed into a prime (1781766004331) 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, 16497833320 + ... + 16497833427.

It is an arithmetic number, because the mean of its divisors is an integer number (247467500610).

Almost surely, 2^{1781766004338} is an apocalyptic number.

1781766004338 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1781766004338 is an abundant number, since it is smaller than the sum of its proper divisors (2177714005422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1781766004338 is a wasteful number, since it uses less digits than its factorization.

1781766004338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32995666758 (or 32995666752 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 54.

The spelling of 1781766004338 in words is "one trillion, seven hundred eighty-one billion, seven hundred sixty-six million, four thousand, three hundred thirty-eight".