781018020043 has 2 divisors, whose sum is σ = 781018020044. Its totient is φ = 781018020042.

The previous prime is 781018019993. The next prime is 781018020053. The reversal of 781018020043 is 340020810187.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (340020810187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781018020043 - 2²⁹ = 780481149131 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 781018019990 and 781018020008.

It is not a weakly prime, because it can be changed into another prime (781018020053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390509010021 + 390509010022.

It is an arithmetic number, because the mean of its divisors is an integer number (390509010022).

Almost surely, 2^781018020043 is an apocalyptic number.

781018020043 is a deficient number, since it is larger than the sum of its proper divisors (1).

781018020043 is an equidigital number, since it uses as much as digits as its factorization.

781018020043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The spelling of 781018020043 in words is "seven hundred eighty-one billion, eighteen million, twenty thousand, forty-three".