256660123 has 12 divisors (see below), whose sum is σ = 267492304. Its totient is φ = 246196800.

The previous prime is 256660087. The next prime is 256660141. The reversal of 256660123 is 321066652.

It is not a de Polignac number, because 256660123 - 2¹³ = 256651931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256660423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101290 + ... + 103792.

Almost surely, 2^256660123 is an apocalyptic number.

256660123 is a deficient number, since it is larger than the sum of its proper divisors (10832181).

256660123 is an equidigital number, since it uses as much as digits as its factorization.

256660123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2646 (or 2605 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 256660123 is about 16020.6155624558. The cubic root of 256660123 is about 635.5057231535.

The spelling of 256660123 in words is "two hundred fifty-six million, six hundred sixty thousand, one hundred twenty-three".