256131663 has 8 divisors (see below), whose sum is σ = 342302976. Its totient is φ = 170357400.

The previous prime is 256131653. The next prime is 256131671. The reversal of 256131663 is 366131652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256131663 - 2¹² = 256127567 is a prime.

It is a super-2 number, since 2×256131663² = 131206857582291138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256131643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97753 + ... + 100338.

It is an arithmetic number, because the mean of its divisors is an integer number (42787872).

Almost surely, 2^256131663 is an apocalyptic number.

256131663 is a deficient number, since it is larger than the sum of its proper divisors (86171313).

256131663 is a wasteful number, since it uses less digits than its factorization.

256131663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198525.

The product of its digits is 19440, while the sum is 33.

The square root of 256131663 is about 16004.1139398593. The cubic root of 256131663 is about 635.0692573313.

The spelling of 256131663 in words is "two hundred fifty-six million, one hundred thirty-one thousand, six hundred sixty-three".