256526045251665 has 64 divisors (see below), whose sum is σ = 496739199075840. Its totient is φ = 110355251097600.

The previous prime is 256526045251613. The next prime is 256526045251789. The reversal of 256526045251665 is 566152540625652.

It is not a de Polignac number, because 256526045251665 - 2¹² = 256526045247569 is a prime.

It is a super-2 number, since 2×256526045251665² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256526045251599 and 256526045251608.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2453215 + ... + 22783115.

It is an arithmetic number, because the mean of its divisors is an integer number (7761549985560).

Almost surely, 2^{256526045251665} is an apocalyptic number.

It is an amenable number.

256526045251665 is a deficient number, since it is larger than the sum of its proper divisors (240213153824175).

256526045251665 is a wasteful number, since it uses less digits than its factorization.

256526045251665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20337002.

The product of its (nonzero) digits is 129600000, while the sum is 60.

The spelling of 256526045251665 in words is "two hundred fifty-six trillion, five hundred twenty-six billion, forty-five million, two hundred fifty-one thousand, six hundred sixty-five".