256651425 has 36 divisors (see below), whose sum is σ = 472130620. Its totient is φ = 133176960.

The previous prime is 256651393. The next prime is 256651441. The reversal of 256651425 is 524156652.

256651425 is a `hidden beast` number, since 2 + 566 + 51 + 42 + 5 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 23386896 + 233264529 = 4836^2 + 15273^2 .

It is not a de Polignac number, because 256651425 - 2⁵ = 256651393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256651425.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 7090 + ... + 23739.

Almost surely, 2^256651425 is an apocalyptic number.

256651425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256651425 is a deficient number, since it is larger than the sum of its proper divisors (215479195).

256651425 is a wasteful number, since it uses less digits than its factorization.

256651425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30882 (or 30874 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 256651425 is about 16020.3440974281. The cubic root of 256651425 is about 635.4985441507.

The spelling of 256651425 in words is "two hundred fifty-six million, six hundred fifty-one thousand, four hundred twenty-five".