256647640246 has 8 divisors (see below), whose sum is σ = 384988025160. Its totient is φ = 128318298528.

The previous prime is 256647640213. The next prime is 256647640331. The reversal of 256647640246 is 642046746652.

256647640246 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-2 number, since 2×256647640246² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256647640193 and 256647640202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2702451 + ... + 2795806.

It is an arithmetic number, because the mean of its divisors is an integer number (48123503145).

Almost surely, 2^256647640246 is an apocalyptic number.

256647640246 is a deficient number, since it is larger than the sum of its proper divisors (128340384914).

256647640246 is a wasteful number, since it uses less digits than its factorization.

256647640246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5521598.

The product of its (nonzero) digits is 11612160, while the sum is 52.

The spelling of 256647640246 in words is "two hundred fifty-six billion, six hundred forty-seven million, six hundred forty thousand, two hundred forty-six".