256402588394 has 8 divisors (see below), whose sum is σ = 384690890628. Its totient is φ = 128172291520.

The previous prime is 256402588357. The next prime is 256402588423. The reversal of 256402588394 is 493885204652.

256402588394 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 251908629025 + 4493959369 = 501905^2 + 67037^2 .

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

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, 14490287 + ... + 14507970.

Almost surely, 2^256402588394 is an apocalyptic number.

256402588394 is a deficient number, since it is larger than the sum of its proper divisors (128288302234).

256402588394 is a wasteful number, since it uses less digits than its factorization.

256402588394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29002680.

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 256402588394 in words is "two hundred fifty-six billion, four hundred two million, five hundred eighty-eight thousand, three hundred ninety-four".