1781361343454 has 48 divisors (see below), whose sum is σ = 3361804798464. Its totient is φ = 692963760720.

The previous prime is 1781361343403. The next prime is 1781361343457. The reversal of 1781361343454 is 4543431631871.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781361343457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283367 + ... + 1908669.

It is an arithmetic number, because the mean of its divisors is an integer number (70037599968).

Almost surely, 2^{1781361343454} is an apocalyptic number.

1781361343454 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1781361343454 is a deficient number, since it is larger than the sum of its proper divisors (1580443455010).

1781361343454 is a wasteful number, since it uses less digits than its factorization.

1781361343454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625981 (or 1625970 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 50.

The spelling of 1781361343454 in words is "one trillion, seven hundred eighty-one billion, three hundred sixty-one million, three hundred forty-three thousand, four hundred fifty-four".