781018020053 has 2 divisors, whose sum is σ = 781018020054. Its totient is φ = 781018020052.

The previous prime is 781018020043. The next prime is 781018020059. The reversal of 781018020053 is 350020810187.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621918349924 + 159099670129 = 788618^2 + 398873^2 .

It is a cyclic number.

It is not a de Polignac number, because 781018020053 - 2¹⁴ = 781018003669 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 781018019995 and 781018020022.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781018020059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390509010026 + 390509010027.

It is an arithmetic number, because the mean of its divisors is an integer number (390509010027).

Almost surely, 2^781018020053 is an apocalyptic number.

It is an amenable number.

781018020053 is a deficient number, since it is larger than the sum of its proper divisors (1).

781018020053 is an equidigital number, since it uses as much as digits as its factorization.

781018020053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 35.

The spelling of 781018020053 in words is "seven hundred eighty-one billion, eighteen million, twenty thousand, fifty-three".