256362661 has 4 divisors (see below), whose sum is σ = 256412524. Its totient is φ = 256312800.

The previous prime is 256362629. The next prime is 256362719. The reversal of 256362661 is 166263652.

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 186322500 + 70040161 = 13650^2 + 8369^2 .

It is a cyclic number.

It is not a de Polignac number, because 256362661 - 2⁵ = 256362629 is a prime.

It is a super-3 number, since 3×256362661³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256362661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256362461) 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, 16200 + ... + 27841.

It is an arithmetic number, because the mean of its divisors is an integer number (64103131).

Almost surely, 2^256362661 is an apocalyptic number.

It is an amenable number.

256362661 is a deficient number, since it is larger than the sum of its proper divisors (49863).

256362661 is an equidigital number, since it uses as much as digits as its factorization.

256362661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49862.

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

The square root of 256362661 is about 16011.3291453271. The cubic root of 256362661 is about 635.2601170467.

Subtracting from 256362661 its reverse (166263652), we obtain a palindrome (90099009).

The spelling of 256362661 in words is "two hundred fifty-six million, three hundred sixty-two thousand, six hundred sixty-one".