256066660 has 24 divisors (see below), whose sum is σ = 540751680. Its totient is φ = 101853024.

The previous prime is 256066649. The next prime is 256066693. The reversal of 256066660 is 66660652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32184 + ... + 39343.

It is an arithmetic number, because the mean of its divisors is an integer number (22531320).

Almost surely, 2^256066660 is an apocalyptic number.

256066660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256066660 is an abundant number, since it is smaller than the sum of its proper divisors (284685020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256066660 is a wasteful number, since it uses less digits than its factorization.

256066660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71715 (or 71713 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 256066660 is about 16002.0829894111. The cubic root of 256066660 is about 635.0155285846.

The spelling of 256066660 in words is "two hundred fifty-six million, sixty-six thousand, six hundred sixty".