256680017 has 8 divisors (see below), whose sum is σ = 282734400. Its totient is φ = 231078960.

The previous prime is 256680001. The next prime is 256680071. The reversal of 256680017 is 710086652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256680017 - 2⁴ = 256680001 is a prime.

It is a super-2 number, since 2×256680017² = 131769262254240578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256680097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112142 + ... + 114407.

It is an arithmetic number, because the mean of its divisors is an integer number (35341800).

Almost surely, 2^256680017 is an apocalyptic number.

It is an amenable number.

256680017 is a deficient number, since it is larger than the sum of its proper divisors (26054383).

256680017 is a wasteful number, since it uses less digits than its factorization.

256680017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226663.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 256680017 is about 16021.2364379283. The cubic root of 256680017 is about 635.5221423048.

The spelling of 256680017 in words is "two hundred fifty-six million, six hundred eighty thousand, seventeen".