781867968019 has 2 divisors, whose sum is σ = 781867968020. Its totient is φ = 781867968018.

The previous prime is 781867967981. The next prime is 781867968029. The reversal of 781867968019 is 910869768187.

781867968019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 781867968019 - 2²⁵ = 781834413587 is a prime.

It is a super-2 number, since 2×781867968019² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (781867968029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390933984009 + 390933984010.

It is an arithmetic number, because the mean of its divisors is an integer number (390933984010).

Almost surely, 2^781867968019 is an apocalyptic number.

781867968019 is a deficient number, since it is larger than the sum of its proper divisors (1).

781867968019 is an equidigital number, since it uses as much as digits as its factorization.

781867968019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 73156608, while the sum is 70.

The spelling of 781867968019 in words is "seven hundred eighty-one billion, eight hundred sixty-seven million, nine hundred sixty-eight thousand, nineteen".