861435725245 has 16 divisors (see below), whose sum is σ = 1058969988720. Its totient is φ = 672318259200.

The previous prime is 861435725207. The next prime is 861435725321. The reversal of 861435725245 is 542527534168.

It can be written as a sum of positive squares in 8 ways, for example, as 85616515609 + 775819209636 = 292603^2 + 880806^2 .

It is not a de Polignac number, because 861435725245 - 2¹³ = 861435717053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 861435725192 and 861435725201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9598741 + ... + 9688069.

It is an arithmetic number, because the mean of its divisors is an integer number (66185624295).

Almost surely, 2^861435725245 is an apocalyptic number.

It is an amenable number.

861435725245 is a deficient number, since it is larger than the sum of its proper divisors (197534263475).

861435725245 is a wasteful number, since it uses less digits than its factorization.

861435725245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136416.

The product of its digits is 8064000, while the sum is 52.

The spelling of 861435725245 in words is "eight hundred sixty-one billion, four hundred thirty-five million, seven hundred twenty-five thousand, two hundred forty-five".