256446024025 has 9 divisors (see below), whose sum is σ = 317996209533. Its totient is φ = 205154793600.

The previous prime is 256446024019. The next prime is 256446024049. The reversal of 256446024025 is 520420644652.

The square root of 256446024025 is 506405.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 129256787529 + 127189236496 = 359523^2 + 356636^2 .

It is not a de Polignac number, because 256446024025 - 2¹⁵ = 256445991257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2481385 + ... + 2582665.

Almost surely, 2^256446024025 is an apocalyptic number.

256446024025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

256446024025 is the 506405-th square number.

256446024025 is the 253203-rd centered octagonal number.

It is an amenable number.

256446024025 is a deficient number, since it is larger than the sum of its proper divisors (61550185508).

256446024025 is an frugal number, since it uses more digits than its factorization.

256446024025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202572 (or 101286 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 256446024025 its reverse (520420644652), we get a palindrome (776866668677).

The spelling of 256446024025 in words is "two hundred fifty-six billion, four hundred forty-six million, twenty-four thousand, twenty-five".