256507133064406 has 24 divisors (see below), whose sum is σ = 447585053907600. Its totient is φ = 109930085777232.

The previous prime is 256507133064361. The next prime is 256507133064517. The reversal of 256507133064406 is 604460331705652.

It is a happy number.

256507133064406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11332425 + ... + 25326628.

It is an arithmetic number, because the mean of its divisors is an integer number (18649377246150).

Almost surely, 2^{256507133064406} is an apocalyptic number.

256507133064406 is a deficient number, since it is larger than the sum of its proper divisors (191077920843194).

256507133064406 is a wasteful number, since it uses less digits than its factorization.

256507133064406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36730468 (or 36730461 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 52.

The spelling of 256507133064406 in words is "two hundred fifty-six trillion, five hundred seven billion, one hundred thirty-three million, sixty-four thousand, four hundred six".