10256566 has 4 divisors (see below), whose sum is σ = 15384852. Its totient is φ = 5128282.

The previous prime is 10256557. The next prime is 10256569. The reversal of 10256566 is 66565201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66565201 = 4079 ⋅16319.

It is a super-2 number, since 2×10256566² = 210394292224712, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10256569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2564140 + ... + 2564143.

It is an arithmetic number, because the mean of its divisors is an integer number (3846213).

Almost surely, 2^10256566 is an apocalyptic number.

10256566 is a deficient number, since it is larger than the sum of its proper divisors (5128286).

10256566 is an equidigital number, since it uses as much as digits as its factorization.

10256566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128285.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 10256566 is about 3202.5873914696. The cubic root of 10256566 is about 217.2704479088.

The spelling of 10256566 in words is "ten million, two hundred fifty-six thousand, five hundred sixty-six".