256403216512006 has 4 divisors (see below), whose sum is σ = 384604824768012. Its totient is φ = 128201608256002.

The previous prime is 256403216511983. The next prime is 256403216512013. The reversal of 256403216512006 is 600215612304652.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×256403216512006³ (a number of 44 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64100804128000 + ... + 64100804128003.

It is an arithmetic number, because the mean of its divisors is an integer number (96151206192003).

Almost surely, 2^{256403216512006} is an apocalyptic number.

256403216512006 is a deficient number, since it is larger than the sum of its proper divisors (128201608256006).

256403216512006 is a wasteful number, since it uses less digits than its factorization.

256403216512006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128201608256005.

The product of its (nonzero) digits is 518400, while the sum is 43.

Adding to 256403216512006 its reverse (600215612304652), we get a palindrome (856618828816658).

The spelling of 256403216512006 in words is "two hundred fifty-six trillion, four hundred three billion, two hundred sixteen million, five hundred twelve thousand, six".