781774561213 has 2 divisors, whose sum is σ = 781774561214. Its totient is φ = 781774561212.

The previous prime is 781774561187. The next prime is 781774561261. The reversal of 781774561213 is 312165477187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 725151027364 + 56623533849 = 851558^2 + 237957^2 .

It is a cyclic number.

It is not a de Polignac number, because 781774561213 - 2⁹ = 781774560701 is a prime.

It is a super-3 number, since 3×781774561213³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781774564213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390887280606 + 390887280607.

It is an arithmetic number, because the mean of its divisors is an integer number (390887280607).

Almost surely, 2^781774561213 is an apocalyptic number.

It is an amenable number.

781774561213 is a deficient number, since it is larger than the sum of its proper divisors (1).

781774561213 is an equidigital number, since it uses as much as digits as its factorization.

781774561213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1975680, while the sum is 52.

The spelling of 781774561213 in words is "seven hundred eighty-one billion, seven hundred seventy-four million, five hundred sixty-one thousand, two hundred thirteen".