256271056425 has 72 divisors (see below), whose sum is σ = 486155071584. Its totient is φ = 128599764480.

The previous prime is 256271056423. The next prime is 256271056439. The reversal of 256271056425 is 524650172652.

256271056425 is a `hidden beast` number, since 2 + 5 + 62 + 7 + 1 + 0 + 564 + 25 = 666.

It is not a de Polignac number, because 256271056425 - 2¹ = 256271056423 is a prime.

It is a super-2 number, since 2×256271056425² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (256271056421) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16374654 + ... + 16390296.

It is an arithmetic number, because the mean of its divisors is an integer number (6752153772).

Almost surely, 2^256271056425 is an apocalyptic number.

256271056425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256271056425 is a deficient number, since it is larger than the sum of its proper divisors (229884015159).

256271056425 is a wasteful number, since it uses less digits than its factorization.

256271056425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19959 (or 19951 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 45.

The spelling of 256271056425 in words is "two hundred fifty-six billion, two hundred seventy-one million, fifty-six thousand, four hundred twenty-five".