256605510734 has 4 divisors (see below), whose sum is σ = 384908266104. Its totient is φ = 128302755366.

The previous prime is 256605510709. The next prime is 256605510761. The reversal of 256605510734 is 437015506652.

It is a happy number.

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

It is a congruent number.

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, 64151377682 + ... + 64151377685.

It is an arithmetic number, because the mean of its divisors is an integer number (96227066526).

Almost surely, 2^256605510734 is an apocalyptic number.

256605510734 is a deficient number, since it is larger than the sum of its proper divisors (128302755370).

256605510734 is a wasteful number, since it uses less digits than its factorization.

256605510734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128302755369.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 256605510734 in words is "two hundred fifty-six billion, six hundred five million, five hundred ten thousand, seven hundred thirty-four".