781263385225 has 12 divisors (see below), whose sum is σ = 974366409996. Its totient is φ = 621397926080.

The previous prime is 781263385213. The next prime is 781263385267. The reversal of 781263385225 is 522583362187.

It can be written as a sum of positive squares in 6 ways, for example, as 29616000649 + 751647384576 = 172093^2 + 866976^2 .

It is not a de Polignac number, because 781263385225 - 2¹¹ = 781263383177 is a prime.

It is a super-2 number, since 2×781263385225² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90315142 + ... + 90323791.

It is an arithmetic number, because the mean of its divisors is an integer number (81197200833).

Almost surely, 2^781263385225 is an apocalyptic number.

It is an amenable number.

781263385225 is a deficient number, since it is larger than the sum of its proper divisors (193103024771).

781263385225 is a wasteful number, since it uses less digits than its factorization.

781263385225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180639116 (or 180639111 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 52.

The spelling of 781263385225 in words is "seven hundred eighty-one billion, two hundred sixty-three million, three hundred eighty-five thousand, two hundred twenty-five".