256724102210161 has 16 divisors (see below), whose sum is σ = 258668734641408. Its totient is φ = 254785728657600.

The previous prime is 256724102210153. The next prime is 256724102210179. The reversal of 256724102210161 is 161012201427652.

It is a cyclic number.

It is not a de Polignac number, because 256724102210161 - 2³ = 256724102210153 is a prime.

It is a super-2 number, since 2×256724102210161² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256724102210101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193937271 + ... + 195256531.

It is an arithmetic number, because the mean of its divisors is an integer number (16166795915088).

Almost surely, 2^{256724102210161} is an apocalyptic number.

It is an amenable number.

256724102210161 is a deficient number, since it is larger than the sum of its proper divisors (1944632431247).

256724102210161 is a wasteful number, since it uses less digits than its factorization.

256724102210161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321632.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 256724102210161 in words is "two hundred fifty-six trillion, seven hundred twenty-four billion, one hundred two million, two hundred ten thousand, one hundred sixty-one".