1781378240047 has 8 divisors (see below), whose sum is σ = 2036026152576. Its totient is φ = 1526771654232.

The previous prime is 1781378239973. The next prime is 1781378240051. The reversal of 1781378240047 is 7400428731871.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1781378240047 - 2⁷ = 1781378239919 is a prime.

It is a super-2 number, since 2×1781378240047² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1781378239976 and 1781378240003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1781378240087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10239253 + ... + 10411774.

It is an arithmetic number, because the mean of its divisors is an integer number (254503269072).

Almost surely, 2^{1781378240047} is an apocalyptic number.

1781378240047 is a deficient number, since it is larger than the sum of its proper divisors (254647912529).

1781378240047 is a wasteful number, since it uses less digits than its factorization.

1781378240047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20663357.

The product of its (nonzero) digits is 2107392, while the sum is 52.

The spelling of 1781378240047 in words is "one trillion, seven hundred eighty-one billion, three hundred seventy-eight million, two hundred forty thousand, forty-seven".