1781160861630 has 64 divisors (see below), whose sum is σ = 4356808803648. Its totient is φ = 465868216320.

The previous prime is 1781160861619. The next prime is 1781160861643. The reversal of 1781160861630 is 361680611871.

It is a self number, because there is not a number n which added to its sum of digits gives 1781160861630.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4940920 + ... + 5289140.

It is an arithmetic number, because the mean of its divisors is an integer number (68075137557).

Almost surely, 2^{1781160861630} is an apocalyptic number.

1781160861630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1781160861630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2178404401824).

1781160861630 is an abundant number, since it is smaller than the sum of its proper divisors (2575647942018).

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

1781160861630 is a wasteful number, since it uses less digits than its factorization.

1781160861630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351501.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 1781160861630 in words is "one trillion, seven hundred eighty-one billion, one hundred sixty million, eight hundred sixty-one thousand, six hundred thirty".