256666411 has 8 divisors (see below), whose sum is σ = 257962320. Its totient is φ = 255374592.

The previous prime is 256666409. The next prime is 256666427. The reversal of 256666411 is 114666652.

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 256666411 - 2¹ = 256666409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256666451) 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, 247951 + ... + 248983.

It is an arithmetic number, because the mean of its divisors is an integer number (32245290).

Almost surely, 2^256666411 is an apocalyptic number.

256666411 is a deficient number, since it is larger than the sum of its proper divisors (1295909).

256666411 is a wasteful number, since it uses less digits than its factorization.

256666411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2045.

The product of its digits is 51840, while the sum is 37.

The square root of 256666411 is about 16020.8118083947. The cubic root of 256666411 is about 635.5109129317.

The spelling of 256666411 in words is "two hundred fifty-six million, six hundred sixty-six thousand, four hundred eleven".