256245649245 has 48 divisors (see below), whose sum is σ = 471334172400. Its totient is φ = 128338624512.

The previous prime is 256245649241. The next prime is 256245649307. The reversal of 256245649245 is 542946542652.

256245649245 is a `hidden beast` number, since 2 + 5 + 62 + 4 + 56 + 492 + 45 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 672935481 + 255572713764 = 25941^2 + 505542^2 .

It is not a de Polignac number, because 256245649245 - 2² = 256245649241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256245649191 and 256245649200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256245649241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 29524 + ... + 716493.

It is an arithmetic number, because the mean of its divisors is an integer number (9819461925).

Almost surely, 2^256245649245 is an apocalyptic number.

It is an amenable number.

256245649245 is a deficient number, since it is larger than the sum of its proper divisors (215088523155).

256245649245 is a wasteful number, since it uses less digits than its factorization.

256245649245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 746494 (or 746491 counting only the distinct ones).

The product of its digits is 20736000, while the sum is 54.

The spelling of 256245649245 in words is "two hundred fifty-six billion, two hundred forty-five million, six hundred forty-nine thousand, two hundred forty-five".