256742760566535 has 16 divisors (see below), whose sum is σ = 410992687674240. Its totient is φ = 136861382046240.

The previous prime is 256742760566527. The next prime is 256742760566549. The reversal of 256742760566535 is 535665067247652.

It is not a de Polignac number, because 256742760566535 - 2³ = 256742760566527 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256742760566535.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4255609825 + ... + 4255670154.

It is an arithmetic number, because the mean of its divisors is an integer number (25687042979640).

Almost surely, 2^{256742760566535} is an apocalyptic number.

256742760566535 is a deficient number, since it is larger than the sum of its proper divisors (154249927107705).

256742760566535 is a wasteful number, since it uses less digits than its factorization.

256742760566535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8511281998.

The product of its (nonzero) digits is 1905120000, while the sum is 69.

The spelling of 256742760566535 in words is "two hundred fifty-six trillion, seven hundred forty-two billion, seven hundred sixty million, five hundred sixty-six thousand, five hundred thirty-five".