256410066 has 16 divisors (see below), whose sum is σ = 559440288. Its totient is φ = 77700000.

The previous prime is 256410059. The next prime is 256410067. The reversal of 256410066 is 660014652.

It is a super-2 number, since 2×256410066² = 131492243892248712, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256410067) 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, 1942435 + ... + 1942566.

It is an arithmetic number, because the mean of its divisors is an integer number (34965018).

Almost surely, 2^256410066 is an apocalyptic number.

256410066 is an abundant number, since it is smaller than the sum of its proper divisors (303030222).

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

256410066 is a wasteful number, since it uses less digits than its factorization.

256410066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885017.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 256410066 is about 16012.8094349493. The cubic root of 256410066 is about 635.2992707593.

The spelling of 256410066 in words is "two hundred fifty-six million, four hundred ten thousand, sixty-six".