256466641 has 4 divisors (see below), whose sum is σ = 271552932. Its totient is φ = 241380352.

The previous prime is 256466621. The next prime is 256466671. The reversal of 256466641 is 146664652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 216207616 + 40259025 = 14704^2 + 6345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256466641 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256466594 and 256466603.

It is not an unprimeable number, because it can be changed into a prime (256466621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7543120 + ... + 7543153.

It is an arithmetic number, because the mean of its divisors is an integer number (67888233).

Almost surely, 2^256466641 is an apocalyptic number.

It is an amenable number.

256466641 is a deficient number, since it is larger than the sum of its proper divisors (15086291).

256466641 is a wasteful number, since it uses less digits than its factorization.

256466641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15086290.

The product of its digits is 207360, while the sum is 40.

The square root of 256466641 is about 16014.5758919804. The cubic root of 256466641 is about 635.3459920310.

The spelling of 256466641 in words is "two hundred fifty-six million, four hundred sixty-six thousand, six hundred forty-one".