256401532346 has 4 divisors (see below), whose sum is σ = 384602298522. Its totient is φ = 128200766172.

The previous prime is 256401532279. The next prime is 256401532397. The reversal of 256401532346 is 643235104652.

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

It can be written as a sum of positive squares in only one way, i.e., 243093372025 + 13308160321 = 493045^2 + 115361^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64100383085 + ... + 64100383088.

Almost surely, 2^256401532346 is an apocalyptic number.

256401532346 is a deficient number, since it is larger than the sum of its proper divisors (128200766176).

256401532346 is a wasteful number, since it uses less digits than its factorization.

256401532346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128200766175.

The product of its (nonzero) digits is 518400, while the sum is 41.

Adding to 256401532346 its reverse (643235104652), we get a palindrome (899636636998).

The spelling of 256401532346 in words is "two hundred fifty-six billion, four hundred one million, five hundred thirty-two thousand, three hundred forty-six".