256745242025 has 12 divisors (see below), whose sum is σ = 335120106000. Its totient is φ = 194585867280.

The previous prime is 256745241943. The next prime is 256745242037. The reversal of 256745242025 is 520242547652.

It is a happy number.

It is not a de Polignac number, because 256745242025 - 2¹² = 256745237929 is a prime.

It is a super-2 number, since 2×256745242025² (a number of 24 digits) contains 22 as substring.

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, 270257675 + ... + 270258624.

It is an arithmetic number, because the mean of its divisors is an integer number (27926675500).

Almost surely, 2^256745242025 is an apocalyptic number.

256745242025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256745242025 is a deficient number, since it is larger than the sum of its proper divisors (78374863975).

256745242025 is a wasteful number, since it uses less digits than its factorization.

256745242025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540516328 (or 540516323 counting only the distinct ones).

The product of its (nonzero) digits is 1344000, while the sum is 44.

Adding to 256745242025 its reverse (520242547652), we get a palindrome (776987789677).

The spelling of 256745242025 in words is "two hundred fifty-six billion, seven hundred forty-five million, two hundred forty-two thousand, twenty-five".